Fixes crash when account password is nil

For some reason, some accounts have a nil password (bad migration?).
If that's the case send and empty password so we get a credentials error
instead of crashing.

Ideally we shouldn't have to send bad credentials to force the login
dialog, but this is a quick crash fix.
Fixed Camera+ (and other) callbacks

When adding Google+ support we added
`application:openURL:sourceApplication:annotation:` to the app delegate.
It seems when this is implemented, iOS doesn't call
`application:handleOpenURL:`
Cancel wp.com operations on sign out

Avoids crashing if you sign out while reader is refreshing
Fix notes sync

After moderation, we weren't updating the note data, where the available
actions are stored.
Merge branch 'develop' of github.com:wordpress-mobile/WordPress-iOS into refactor

Also fixed GPP pod and committing podfile to avoid sub[sub]version
dependency problems

Conflicts:
	WordPress/Classes/WPAccount.m
	WordPress/Classes/WordPressAppDelegate.m