Adjustments to Views for Keyboard Show

Adjusts the following views should the keyboard appear:
ListingDetailViewController, SearchViewController. Uses a listener
(NSNotificationCenter) for if the keyboard displays. Could also use a
keyboard hidden, but because I’m using the gesture to dismiss the
keyboard, there would be no Notification that is sent to the
‘keyboardWillBeHidden’ func.

Essentially, the view adjustments will insert contentInsets to the
super scrollViews.

[DNF… NEXT COMMIT TO COMPLETE!] For the MessageViewController, the
super view is actually a single view (not a UIScrollView). It’s a view
(“messageView”) with the UITextView for the message text and the ‘Send’
button and an UITableViewController for the list of prior messages.
Thus, when the keyboard appears, will move the messageView up, and
resize the UITableView… the height of the keyboard.

Changed the keyboard type for the price fields of the search to decimal
pads.
Implemented Push Notifications. Messages suck

Implemented Push Notifications via Parse. Notification appears when a
message is sent.

However, the MessageViewController does not work due to updates to the
constraints to accommodate the multiple iPhone sizes.