Implemented embedding of PDF documents as per #5505
Updated instructions above the content field in the media creation form
Added tags to links as per feature #5454

Conflicts:

	app/models/default.rb
	db/schema.rb
Enhanced a solution for the feature #5454

  * Added a show method in the controller
  * Implemented the view template
  * Modified the controller to redirect to the show page
Implemented redirecting to a list of links to a proper pagination page after link is being created
The user search feature:

* Used the common_index for the users search
* Provided "public" and "active" dummy methods on User
* Provided a proper partial for every item in the list of users
* Added "Users" to the top navigation links
* Added "Users" to a search drop down
* Fixed the handling of a use case when there is no "keywords" parameter provided for the users search
* Fixed the issue with searching for users while being logged in
* Removed unused view file
Feature #4951 - expand all playlist items/subplaylists

Conflicts:

	public/stylesheets/playlists.css
Enhanced the solution for feature #4951

* Improved the load time for playlists
* Added hover over messages for wedge