Updated podspec

Fixed unbalanced transition callings

Expose containerViewTapGesture

Forward appearance methods to the appropriate child view controller

Updated README.md

Added upstream repo examples

Updated podspec

Make alpha and animation duration settings configurable

Make gesture recognizers public

`addChildViewController` should be called before accessing the child's `view`

Updated podspec

Changed access level according to swift version

Fixed an animation issue, bump version

Update podspec

Fixed some warnings