change send imageview scale type to centerCrop
modify showvideo by system
Merge branch 'master' into easemob-dev

Conflicts:
	ChatDemoUI/res/layout/row_sent_picture.xml
update res
support show stranger message
add file
add message web link
Merge branch 'easemob-dev' of https://github.com/easemob/sdkexamples-android into easemob-dev
close strictmode
update demo to show all conversation
remove async send text
chathistory fragment filter empty conversation
show group members size
update ui
modify encrpty img download
update ui
update uidemo
send offline message broadcast to ui
change back default setting to not use encryption
update uidemo