fix #1474: theme search was crashing
Added onSaveInstanceState() fix for Android bug #19917
Moved initial update from ReaderActivity.onResume() to ReaderActivity.onPostResume()
Switched to commitAllowingStateLoss() for an extra level of safety
Merge pull request #1477 from wordpress-mobile/issue/1474-npe-theme-tab-fragment

fix #1474: theme search was crashing
Merge pull request #1479 from wordpress-mobile/issue/1475-illegal-state-tag-fragment

Issue/1475 illegal state tag fragment
Merge branch 'master' into develop