trigger Media Scan on:
- download
- delete local (on list and details)
- delete local & remote (on list and details)
Added text file preview
Reworked the text file preview system to avoid UI freezes with large text files
Fixed a mistake.
Removed any remains of list appearance
Merge remote-tracking branch 'upstream/develop' into triggerMediaScan

Conflicts:
	src/com/owncloud/android/ui/fragment/OCFileListFragment.java
	src/com/owncloud/android/ui/preview/PreviewImageActivity.java
	src/com/owncloud/android/ui/preview/PreviewImageFragment.java
- update to obey non-image files
- fixed wrong project.properties
- moved MediaScan to DownloadFileOperation.
- cleaned up
- clean up 2
Added 'Copy' action
Added 'ACTION_COPY_FILES'.
Fixed 'Move' action
Added CopyActivity
Added copy action
Added error messages for copy action. English only.
Merge deletion of standard submodule
Removed .gitmodules
Updated submodule to point to the branch with the additional stuff for the copy action