first step to let a wpcom user without blog to sign in
second step to allow a wpcom user to signin without blog
Merge branch 'develop' into issue/343-wpcom-user-no-blog

Conflicts:
	src/org/wordpress/android/ui/WPActionBarActivity.java
Merge branch 'develop' into issue/343-wpcom-user-no-blog
don't setup current blog if the user is not signed in
show the reader instead of the post list when the user login with a wpcom account without blog
Remove post signature when the user doesn't have visible blogs
use DB.getNumVisibleAccounts instead of DB.getVisibleAccounts to count visible blogs
Merge branch 'develop' into issue/343-wpcom-user-no-blog
Merge branch 'develop' into issue/343-wpcom-user-no-blog
hide blogs category in Settings->Notifications screen
Merge pull request #469 from wordpress-mobile/issue/343-wpcom-user-no-blog

Fix #343 - Let wpcom user without blog to sign in with limited access