broadcast an event on blog changed
add a broadcast receiver to PostsActivity
stop running tasks in PostsListFragment onBlogChanged
remove onBlogChanged broadcast since I can't remove WPActionBar.onBlogChanged easily (postponing this task when we remove WPActionBarActivity)
don't use getCurrentBlog in ApiHelper.refreshComments()
replace refreshBlogContentTask by requestPosts when PTR is refreshed in PostsList
fix #1103-like issue for comments
Merge branch 'develop' into issue/1103-stop-progress-bar-onblogchange
fix #1106
merge VerifyCredentialsCallback with the default used in PostsActivity.onCreate
Broadcast a message on xmlrpc access error (like invalid credentials, 2fa)
show connection alert when the wrong credentials event detected
Merge branch 'develop' into issue/1103-stop-progress-bar-onblogchange

Conflicts:
	src/org/wordpress/android/ui/posts/PostsActivity.java
only use broadcasted events to ask the user to enter credentials/auth ssl certificate
incorrect password xmlrpc response test file
Catch and check XMLRPCFault instead of XMLRPCException
Merge pull request #1107 from wordpress-mobile/issue/1103-stop-progress-bar-onblogchange

fix #1103 stop progress bar onblogchange