Updated phpUnit dependency.
Updated PHPUnit.
Added Symfony 2.4 Travis build, updated dependencies.
Migrated project to PSR4 autoloader.
Allowed 3.x version of SesioFrameworkExtraBundle.
Updating Composer in Travis CI to enable PSR4 autoloader.
Revert "Allowed 3.x version of SesioFrameworkExtraBundle."

This reverts commit ee2d6d342ecdf0cac4cc72edcd3c5a1dcff3ee84.
File MIME type detection and listing.
[#20] Custom action handlers.
[fixes #20] Documentation for pluggable file actions handlers.
[fixes #22] Simple text editor action handler.
Code refactoring to avoid some code duplication.
Simple image viewer.
Fixed failing test for Symfony 2.2.
0.1.3 assets.