Fixes crash when canceling navigation transition

It seems viewDidDisappear can get called even when viewDidAppear never
was. Filed a radar about this, but let's use the viewWill* methods
meanwhile
Merge branch 'develop' into release/3.8.1
Fixes #103 - No title on previous view causes no back button to appear - added a backBarButtonItem to view controller before pushing categories controller.
Updated the README to reflect recent changes in issue reporting and blog locations
Missed a carriage return in README.md file
Merge branch 'develop' into release/3.8.1
Don't crop gravatars on notification cells

resolves #96
Don't override note data on updateAttributes

`updateAttributes:` might get called with a partial response (e.g. only
id and unread fields included) and we'd lose data about the note.

resolves #100, probably resolves #101
Better position of switch in table cells

resolves #94
Make web view toolbar buttons white on iOS 6

resolves #93
Merge branch 'release/3.8.1' into develop
Fixes #102 - Added UIScreenEdgePanGestureRecognizer to screen (iOS 7 only) to handle making the sidebar appear with the off-edge swipe.
Bump version to 3.8.1
Updated translations
Merge branch 'release/3.8.1' into develop
Updated WordPressApi pod

- Disable compression by default
Enable compression for WordPress.com requests
Fixes #116 - Put posts into publish mode when editing - this drops the draft status since you have to cancel again to go back to draft
Revert "Fixes #116 - Put posts into publish mode when editing - this drops the draft status since you have to cancel again to go back to draft"

This reverts commit 0e01da55c5574ee52bdbac030409848a863c4b10.
Set post status correctly

We were setting post titles instead of values (e.g. Published instead of
publish) so XML-RPC was ignoring the unrecognized values and leaving
them untouched

Resolves #116