Merge pull request #25 from grandcentrix/day_digits_fix

Fixed frame calculation by removing hardcoded day digit digit count.
updated podspec
basic ios7 example app design changes
added ios7 flipview assets
fixed layout for ios7
udpated example app Icons
updated fonts for ios7 / layout fixes
Merge branch 'feature/ios7styling'
readme update
updated screenshots
cleaned up app icons
build active arch only
fixed flickering on ios7, fixes #27
some refactoring
updated project settings & readme
added reverseFlippingDisabled property
date countdown should never flip reverse
added reverseFlippingDisabled setting to example project
updated podspec
bring flip view to zindex 0 again.