Merge pull request #3 from akuraru/master

UIRefreshControlを追加
0.5.0
fix podspec
0.6.0
0.6.0
fix(header): public `handleActionButton:`
bump 0.7.0
fix(URL): fix wrong early return
bump 0.7.1
fix(iOS8): fix showing Activities on iOS(
bump 0.7.2
fix(goToAddress): add guard for goToAddress
bump 0.7.3
fix(AllIn): fix storyboard name.
Update CrayWebViewController.podspec