Added maxWidth and maxHeight for sizes.

Sometimes there may be the need to limit the maximum size of a modal to be consistent in size/layout for the user.
Update PR in order to not go outside the viewport

Merge branch 'patch-1' of https://github.com/Blackskyliner/nyroModal into Blackskyliner-patch-1

Conflicts:
	js/jquery.nyroModal.js
Merge branch 'Blackskyliner-patch-1'