Update contentType length

In some case the contentType can be more than 64 characters, Mysql truncate the string in that case however PostgreSQL throws an exception.
Fix PHPCR repository class
Merge pull request #568 from rpg600/patch-1

Update contentType length
add api_form service configs for mongodb and phpcr
Merge pull request #618 from MAXakaWIZARD/pr-mongo-phpcr-config-fixes

Add api_form service configs for mongodb and phpcr
Added php 5.6 to .travis.yml
Merge pull request #612 from interstroom/master

Add Symfony v2.5 to travis
fix issue with missing end() call
fix regression with filter management
[FIX] Typo
Merge pull request #625 from Th3Mouk/master

[FIX] Typo
Merge pull request #604 from alain-flaus/fix_phpcr_repository_class

Fix PHPCR repository class: "Sonata\MediaBundle\PHPCR\GalleryHasMediaRepository" is declared twice
initial support for category (ie, folder)
improve support for mozaic mode
improve support for new filter mode
rename file to fix typo
frontend update for mosaic media view
Merge pull request #627 from juherpin/master

Frontend update for mosaic media view
fix bug with double saving of media
fix category management when creating a media