Upgrade Bootstrap to 3.0.1

* Remove bootstrap gems from bundle

* Remove bootstrap-sass and bootswatch-rails from bundle.

* Add the bootstrap.min.css file provided by getbootstrap.com as
  bootstrap.css.

* Add the bootstrap.min.js file provided by getbootstrap.com as
  bootstrap.js.

* Remove imports in bootstrap_and_overrides.css.scss for bootswatch/cyborg
  and bootstrap-responsive stylesheets.

* Add the bootstrap.min.css file for Cyborg provided by bootswatch.com as
  bootswatch.css and add import.

* Migrate layouts/application.html to Bootstrap 3
  - Change span12 to col-md-12

* Migrate layouts/_messages.html to Bootstrap 3
  - Change alert-error to alert-danger.

* Migrate layouts/_navigation.html to Bootstrap 3
  - Add navbar-default
  - Remove navbar-inner
  - Add navbar-header
  - Change collapsible navbar from link to button
  - Change brand to navbar-brand
  - Change nav-collapse to navbar-collapse
  - Use header element instead of div and add aria role
  - Use nav element instead of div and add aria role
  - Change navbar list to use navbar-right instead of pull-right

* Migrate webpage_requests.css.scss to Bootstrap 3
  - Remove max-width for URL form input

* Migrate url form to Bootstrap 3
  - Remove form-inline from form
  - Add aria role to form
  - Use col-xs-offset-1 and col-xs-10 classes to size form
  - Add input-group to form
  - Change input-block-level to form-control for URL input field
  - Use span.input-group-btn for "Go!" button

* Migrate webpages/show.html to Bootstrap 3
  - Change jumbotron and subhead to page-header
  - Change h6.muted to small
  - Remove subnav
  - Change nav pills to nav tabs
  - Change span12 to col-xs-12

* Migrate webpages/_overview.html to Bootstrap 3
  - Change span5 to col-xs-12 and col-md-6

* Migrate webpages/_http_headers.html to Bootstrap 3
  - Change span1 and span10 to col-xs-12, col-md-offset-1, and col-md-10

* Migrate webpages/_view_source.html to Bootstrap 3
  - Change span1 and span10 to col-xs-12, col-md-offset-1, and col-md-10

* Migrate webpages/_screenshot.html to Bootstrap 3
  - Change span1 and span10 to col-xs-12, col-md-offset-1, and col-md-10
  - Change thumbnail to img-thumbnail and change span9 to col-xs-12 and
    col-md-9

* Migrate Devise shared links to Bootstrap 3
  - Change inline to list-inline

* Migrate devise forms to Bootstrap 3
  - Change to form-horizontal
  - Add page-header
  - Add form-group
  - Add form-control to input fields
  - Change size of input fields to col-xs-12 and col-md-4