Merge pull request #3 from bkook/develop

Develop
Merge pull request #4 from bkook/develop

Develop
Update README.md
Update README.md
Update README.md
Merge pull request #5 from bkook/develop

changed activate method.
updated podspec version.
Merge pull request #6 from bkook/develop

fix a bug that lock screen is not presented.
updated podspec version.
Fixed animation when dismiss passcode view controller on iOS 8
updated podspec.
fixed a bug that keyboard is not showing at lock screen on iOS 6.
removed label background.
iOS 6 bugfix.
Update README.md
iOS 8 bugfix.
update podspec.
Merge branch 'master' of github.com:bkook/BKPasscodeView
fix a bug in landscape mode.
edit podspec file.