Make view admin open in Safari

By looking at user feedback, it seems having the admin embedded in the
app is often more confusing that helpful.
Fixes missing refresh header on notifications view.

There was a xib for the notifications list view. Redundant since its inheriting from WPTableViewController.  The loaded xib resulted in two UITableViewControllers, one a child of the other.
Removing the xib and calling init instead of initWithNibName:bundle fixes the issue where the refresh header would sometimes appear to be missing when scrolling the extra UITableView.

Also removes a now obsolete xib for the hybrid reader.
Merge branch 'release/3.7' of https://github.com/wordpress-mobile/WordPress-iOS into release/3.7
Fix build warning: unused variable
Fixes an issue where quick post/page + buttons showed the wrong state.

The UITableViewCell was setting the accessory view's highlighted state to YES. Not sure if this is happening in the code somewhere and I couldn't find it or if this is something Apple does by design. Setting the highlighted state to NO when the cell's selection state changes seems to fix the problem.
Fixes layout concerns with the View Admin button.

The view admin button would overlap the view site button, and show up even when the section was closed.
Restores the View Admin cell and populates it with a button. The button intercepts the tap on the row and avoids triggering row selection.
Seems to work well enough tho the button icon dims when pressed and the icons in cells do not.  Minor difference.
Merge branch 'release/3.7' into develop