storing settings value source information

fix delete msg with oembed problem -  closes #1429

view renders oembed in msg - even if msg type is 'rm'

Cordova

Fix Push configuration in the new raix:push version and save the android sender id to pass to mobile apps

moved to Dockerfile

even though default avatar upload is GridFS, many docker users continue to change it to FileSystem

correct typos (in commented lines)

even though default is GridFS storing to mongo; for some reasons, many docker users still insist on changing it to FileSystem