Added initial "New post" functionality
 "New post": handling NPE when no images in message
Merge remote-tracking branch 'origin/master' into FEAT_New_post

Conflicts:
	frontend/app/views/menu.html
"New post": fixed reading token
Merge branch 'master' into FEAT_New_post
Merge remote-tracking branch 'origin/master' into FEAT_New_post
"New post": added initial tests