Add logging of errors if API initialization fails

It'll give us some more insight as to why the credentials are missing on
notification
Merge branch 'develop' of github.com:wordpress-mobile/WordPress-iOS into develop
Longer timeout for async tests

It feels our build server isn't fast enough so increase timeout to avoid
failing tests
More logging for WordPressComApi
#278 - Remove old wordpress.log file at launch if it exists
#212 - Replace instances of HelpViewController with the new SupportViewController.
Additional testing is needed to ensure proper display of navbar controls for navigation in the different scenarios (iPad vs iPhone mostly)
Merge branch 'develop' into coredata-arch

Conflicts:
	WordPress/Classes/AddUsersBlogsViewController.m
	WordPress/Classes/WPTableViewController.m
	WordPress/Classes/WordPressAppDelegate.m
derivedContext method name change + notifications

- derivedContext -> newDerivedContext

- Use notifications to monitor propagated changes to the main context to save it, and the master context.