Redraw TKRetroButton when inset width is set.
Updating podspec.
Merge commit 'd68203868502c2f54b2cecf2f4bc0db49face56a'

* commit 'd68203868502c2f54b2cecf2f4bc0db49face56a':
  Updating podspec.
  Redraw TKRetroButton when inset width is set.