引导css自定义和javascript不加载(Ruby 1.9.3p547, Rails 4.1.4)

我现在正在构建一个基本的RoR应用程序，但是在我的开发和生产环境中，我无法对bootstrap css进行自定义，并且javascript没有加载(然而，它是用于我的主页上的JW Player)。例如，导航栏的下拉功能不起作用，当我试图删除文件时，"销毁"功能不起作用。

这是我的Gemfile:

    source 'https://rubygems.org'
    ruby '2.0.0'
    # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
    gem 'rails', '4.0.2'
    # Use SCSS for stylesheets
    gem 'sass-rails', '~> 4.0.0'
    # Use Uglifier as compressor for JavaScript assets
    gem 'uglifier', '>= 1.3.0'
    # Use CoffeeScript for .js.coffee assets and views
    gem 'coffee-rails', '~> 4.0.0'
    # See https://github.com/sstephenson/execjs#readme for more supported runtimes
    # gem 'therubyracer', platforms: :ruby
    # Use jquery as the JavaScript library
    gem 'jquery-rails'
    # Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
    gem 'turbolinks'
    # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
    gem 'jbuilder', '~> 1.2'
    gem 'bootstrap-sass'
    gem 'devise', '~> 3.1.0.rc2'
    gem 'rake', '~> 10.3.2'
    gem 'jwplayer-rails', '~> 1.0.1'
    group :development, :test do
        gem 'sqlite3'
    end
    group :production do
        gem 'pg'
        gem 'rails_12factor'
    end
    group :doc do
      # bundle exec rake doc:rails generates the API under doc/api.
      gem 'sdoc', require: false
    end
    # Use ActiveModel has_secure_password
    # gem 'bcrypt-ruby', '~> 3.1.2'
    # Use unicorn as the app server
    # gem 'unicorn'
    # Use Capistrano for deployment
    # gem 'capistrano', group: :development
    # Use debugger
    # gem 'debugger', group: [:development, :test]
*/-------------------------------------------------*/
Application.js:
//= require jwplayer.shuffle
//= require jwplayer.shuffle.min
//= require bootstrap
//= require jquery
//= require jquery_ujs
//= require turbolinks
//= require_tree .
*/-------------------------------------------------*/
Application.css:
 *= require_tree .
 *= require_self
 */
*/-------------------------------------------------*/
I placed these css customizations in an scss file, which are not being recognized: 
@import "bootstrap";
$body-bg:                      #ecf0f1;
$font-family-sans-serif:       'Lato', sans-serif;
$navbar-height:                110px;                        
$navbar-margin-bottom:         0px;
$navbar-default-bg:            black;
$navbar-default-brand-color:   #ffffff;
$brand-primary:                #ff00ff;
$link-hover-color:             #00ffff;
*/-------------------------------------------------*/
Application.html.rb file: 
  <%= stylesheet_link_tag    'application', media: 'all', 'data-turbolinks-track' => true %>
  <%= javascript_include_tag 'application', 'data-turbolinks-track' => true %>
  <%= csrf_meta_tags %>
Development.rb file: 
Rails.application.configure do
  # Settings specified here will take precedence over those in config/application.rb.
  # In the development environment your application's code is reloaded on
  # every request. This slows down response time but is perfect for development
  # since you don't have to restart the web server when you make code changes.
  config.cache_classes = false
  # Do not eager load code on boot.
  config.eager_load = false
  # Show full error reports and disable caching.
  config.consider_all_requests_local       = true
  config.action_controller.perform_caching = false
  # Don't care if the mailer can't send.
  config.action_mailer.raise_delivery_errors = false
  # Print deprecation notices to the Rails logger.
  config.active_support.deprecation = :log
  # Raise an error on page load if there are pending migrations.
  config.active_record.migration_error = :page_load
  # Debug mode disables concatenation and preprocessing of assets.
  # This option may cause significant delays in view rendering with a large
  # number of complex assets.
  config.assets.debug = true
  # Adds additional error checking when serving assets at runtime.
  # Checks for improperly declared sprockets dependencies.
  # Raises helpful error messages.
  config.assets.raise_runtime_errors = true
  # Raises error for missing translations
  # config.action_view.raise_on_missing_translations = true
end
*/-------------------------------------------------*/
Production.rb: 
Rails.application.configure do
  # Settings specified here will take precedence over those in config/application.rb.
  # Code is not reloaded between requests.
  config.cache_classes = true
  # Eager load code on boot. This eager loads most of Rails and
  # your application in memory, allowing both threaded web servers
  # and those relying on copy on write to perform better.
  # Rake tasks automatically ignore this option for performance.
  config.eager_load = true
  # Full error reports are disabled and caching is turned on.
  config.consider_all_requests_local       = false
  config.action_controller.perform_caching = true
  # Enable Rack::Cache to put a simple HTTP cache in front of your application
  # Add `rack-cache` to your Gemfile before enabling this.
  # For large-scale production use, consider using a caching reverse proxy like nginx, varnish or squid.
  # config.action_dispatch.rack_cache = true
  # Disable Rails's static asset server (Apache or nginx will already do this).
  config.serve_static_assets = false
  # Compress JavaScripts and CSS.
  config.assets.js_compressor = :uglifier
  # config.assets.css_compressor = :sass
  # Do not fallback to assets pipeline if a precompiled asset is missed.
  config.assets.compile = false
  # Generate digests for assets URLs.
  config.assets.digest = true
  # `config.assets.precompile` has moved to config/initializers/assets.rb
  # Specifies the header that your server uses for sending files.
  # config.action_dispatch.x_sendfile_header = "X-Sendfile" # for apache
  # config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for nginx
  # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
  # config.force_ssl = true
  # Set to :debug to see everything in the log.
  config.log_level = :info
  # Prepend all log lines with the following tags.
  # config.log_tags = [ :subdomain, :uuid ]
  # Use a different logger for distributed setups.
  # config.logger = ActiveSupport::TaggedLogging.new(SyslogLogger.new)
  # Use a different cache store in production.
  # config.cache_store = :mem_cache_store
  # Enable serving of images, stylesheets, and JavaScripts from an asset server.
  # config.action_controller.asset_host = "http://assets.example.com"
  # Precompile additional assets.
  # application.js, application.css, and all non-JS/CSS in app/assets folder are already added.
  # config.assets.precompile += %w( search.js )
  # Ignore bad email addresses and do not raise email delivery errors.
  # Set this to true and configure the email server for immediate delivery to raise     delivery errors.
  # config.action_mailer.raise_delivery_errors = false
  # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
  # the I18n.default_locale when a translation cannot be found).
  config.i18n.fallbacks = true
  # Send deprecation notices to registered listeners.
  config.active_support.deprecation = :notify
  # Disable automatic flushing of the log to improve performance.
  # config.autoflush_log = false
  # Use default logging formatter so that PID and timestamp are not suppressed.
  config.log_formatter = ::Logger::Formatter.new
  # Do not dump schema after migrations.
  config.active_record.dump_schema_after_migration = false
end
*/-------------------------------------------------*/

有谁能帮助解决这个问题吗?我将不胜感激。正如我在标题中提到的，我正在运行ruby 1.9.3和rails 4.1.4。