Add Crop filter support
Add service config for new crop filter
Add docs for new crop filter
Merge pull request #123 from ardianys/develop

Add crop filter implementation
catch exception when invalid filter is used
Merge pull request #136 from kbond/patch-1

catch exception when invalid filter is used
Update composer.json
added missing use statement
Merge pull request #138 from kbond/patch-1

added missing use statement
Merge pull request #137 from ejsidisi/develop

Relation to develop branch of "avalanche123/Imagine"
Fixed bug with symfony 2.3
Merge branch 'develop'