Added Find Owning View Controller command

Shortcut is `fovc`. Given an input `UIView` this command will walk the next
responder chain until it fines the UIViewController that owns this view.
Fix description for fovc command

Fixes comment at https://github.com/facebook/chisel/pull/13/files#r10396271
Add found view controller to pasteboard
Handle int conversion exceptions
Moved the fovc function into the fvc function

fvc will default to searching for view controllers via class name regex. If the --view option is set, we can search for the owning view controller.
Merge pull request #13 from jkubicek/master

Added Find Owning View Controller command