Store etags in the file cache
Use etags from file cache in SabreDAV connector
Remove old etag code
Update etags in parent folders
Fix function name
Change length of etag field to 40
Merge branch 'filesystem' into filesystem-etags

Conflicts:
	lib/files/cache/updater.php
Fix eTagUpdate and add tests
Merge branch 'filesystem' into filesystem-etags

Conflicts:
	lib/files/cache/cache.php
Don't use more entropy for etags
Remove old create etag function
Merge branch 'filesystem' into filesystem-etags
Bump version
Don't waste time making another call since we know it doesn't exist
Wrap the etag in double quotes
Merge pull request #1052 from owncloud/filesystem-etags

ETags stored in the file cache