add image format xml schema
add format reader
add liipthemebundle to test appkernel
fix merge conflicts
cleaned code
updated xsd
changed xsd for image formats
Merge pull request #31 from sulu-cmf/feature/format-reader

[FEATURE] format reader
Merge branch 'develop' of git://github.com/sulu-cmf/SuluMediaBundle into feature/content_type_tags