OC-922: Refresh of folder
OC-922: Synchronize folder, refresh folder size
Fix bug: When you browses up, the folder and files dissapears
OC-1193:Add etag to DB
OC-1196 OC-1195: Obtain etag from de Server and save it
OC-1194: Adapt Sync Process using etag
OC-1230
OC-1250: Fix bug - App crashes when you enter in an account with a lot of files
Merge branch 'develop' into refresh_folder_contents_when_browsed_into

Conflicts:
	src/com/owncloud/android/operations/SynchronizeFolderOperation.java
OC-1380: Fix Start Synchroniztion fails
OC-1388: Refresh
Merge branch 'develop' into refresh_folder_contents_when_browsed_into
Merge branch 'develop' into refresh_folder_contents_when_browsed_into
OC-1230: app doesn't show the folders structure correct for a while. Improve Sync Proccess
OC-1507: When you browse up, < is shown all the time in the top bar
Change the loop mChildren update to the previous version
OC-1508: App crashes when changing the orientation
Merge remote-tracking branch 'origin/develop' into refresh_folder_contents_when_browsed_into
OC-1507- Reopened. Browse up <
Merge branch 'develop' into refresh_folder_contents_when_browsed_into