\OC\Preview

OC\Preview
==========

This pull requests contains the implementation of the class \OC\Preview.
It also contains updated versions of the files, files_sharing and the files_trashbin app. Those apps make now use of the new preview lib.
To test this pull request, you might need to checkout https://github.com/owncloud/3rdparty/tree/oc_preview

please review 
@karlitschek
@jancborchardt
@DeepDiver1975
@LukasReschke