fix hard coded string
fix #1254 and style
Merge pull request #1255 from wordpress-mobile/issue/1254-npe-mediaeditfragment

fix #1254 npe mediaeditfragment
Remove pre-emptive HTTP authentication.
Remove unused imports
Merge pull request #1268 from wordpress-mobile/issue/1265-remove-preemptive-http-auth

Remove pre-emptive HTTP authentication on self-hosted blogs protected with HTTP Auth
2.7.3 version bump
Merge branch 'master' into develop