Don't reset wp.com username on failed login

git-svn-id: http://ios.svn.wordpress.org/trunk@4048 7d847f7c-ffe1-4a24-85be-b788d016d96a
Remove the WPInfoView from the Superview before adding/re-adding it- Fixes #1557.

git-svn-id: http://ios.svn.wordpress.org/trunk@4049 7d847f7c-ffe1-4a24-85be-b788d016d96a
Present wp.com login dialog when credentials are invalid

git-svn-id: http://ios.svn.wordpress.org/trunk@4050 7d847f7c-ffe1-4a24-85be-b788d016d96a
Fix crash when removing the last comment on the list

The observer on _comment.status was being triggered when the comment was
deleted. Being the last comment, there were no sections after it was
deleted, so `indexPathForNextComment` was crashing

git-svn-id: http://ios.svn.wordpress.org/trunk@4051 7d847f7c-ffe1-4a24-85be-b788d016d96a
Don't try to show notifications if we're signed out

git-svn-id: http://ios.svn.wordpress.org/trunk@4052 7d847f7c-ffe1-4a24-85be-b788d016d96a
Added an extra check for a notification value

git-svn-id: http://ios.svn.wordpress.org/trunk@4053 7d847f7c-ffe1-4a24-85be-b788d016d96a