Merge pull request #2 from akuraru/master

add `+showFromViewController:URL:`
convert podspec to json
0.3.0 
update readme
style(Standalone): apply autolayout
feat(ipad): Support iPad
Update readme
0.3.1
feat(WebViewController): add CrayAllInOneBackWebViewController
chore(example): update example views
chore(readme): add CrayAllInOneBackWebViewController
0.4.0
chore(webview): apply `scaleToFill` by default 
0.4.1