[Demo] Add another view with a outlet to a constraint

Add a second example view (TwoViewsWithConfigurableSpace) to
demonstrate the reconnecting of ‘NSLayoutConstraint IBOutlets’.
There are just two black views but the space between them is
configurable via IB (property space).
[NibLoading] Reconnect outlets to constraints

When copying the view constraints from the containerView to the Nib-loaded view
also replace outlets to those old constraints with the new ones.
[Cleanup] Typos, formatting and comments
Merge pull request #9 from n-b/ReconnectOutletToConstraints

Reconnect outlet to constraints