delete local source files for BTRScroll/ClipView
resolve linker issue
use new external files for BTRScroll/ClipView
remove (now) irrelevant demo
Add comment explaining -sizeToFit
Merge pull request #46 from ButterKit/btrpopupbutton-alignment

Fix text field layout on OS X 10.8
Merge pull request #47 from ButterKit/scroll-view-submodule

Make the scroll & clip view files a submodule.
make the headers public for BTRScrollView/ClipView
Merge pull request #50 from ButterKit/public-headers

Make the headers public for BTRScrollView/ClipView
Merge branch 'master' into btrcontrol-state-additions