Fix up NewAddUsersBlogsVC + object faulting issue

- NewAddUsersBlogsVC and AddUsersBlogsVC were confusing. Ensured blog creation was the same as AddUsersBlogsVC

- Use existingObjectWithID instead of objectWithID, which on a second sign in after sign out was causing an error with Core Data.

Conflicts:
	WordPress/Classes/NewAddUsersBlogViewController.m
Fix ViewDidLoad typo in comment
Merge pull request #283 from ibrahimkteish/develop

Fix ViewDidLoad typo in comment
Update categories for iOS 6

- Also make resetting the categories consistent in both locations

Fixes #290
Remove resize mask from reader fullscreen image

Fixes #284
BarButtonItem was using wrong enum for type

Fixes #291
Removed fly in effect for reader posts
Merge branch 'develop' of github.com:wordpress-mobile/WordPress-iOS into develop
Use device orientation change due to modals

ViewControllers in the panel navigation controller stack don't rotate when there is a modal on visible.

Fixes #300