Fix improper nil check
Merge pull request #59 from tonyarnold/patch-1

Fix improper nil check
import BTRLabel to fix build issue in BTRPopUpButton
Merge pull request #60 from ButterKit/fix-popup-imports

Fix imports in BTRPopUpButton
fix a reference cycle in the popup button
Merge pull request #61 from ButterKit/fix-cycle

Fix a reference cycle
move most common initializers to static functions
move BTRImageView's common initializer to a static function, fix bug
Merge pull request #62 from ButterKit/namespacing

Namespacing
Fix build when prefix header is disabled.
Merge pull request #63 from wjk/fix-build

Fix build when prefix header is disabled.