Added new parameters to ChunkManagerInterface.
Fixed a bug where chunked uploads where validated twice.

Fixes #36.
Added the size to the temporary created UploadedFile, so clientSize won't be null.

Details in #36.
Makes the buffer size for syncing files to gaufrette storages customizable.

This fixes #37.
Merge branch 'master' of github.com:1up-lab/OneupUploaderBundle