added composer.json
adding media interfaces and a download controller draft
renaming caption to description
Model + adapters
Updated gaufrette adapter + download controller
gaufrette adapter - changed flush to autoFlush
add contributing doc
Fixed Image Resource persisted + added copyContentFromFile to interface + added TODOs
Optimized ModelToFileTransformer
Merge pull request #5 from rmsint/test

[WIP] model + adapters