Closed Position + IBInspectable Support

• IBInspectable support for PullerDrawerViewController settings.
• Formally added / fixed edge cases for a 'closed' drawer position.
• Added "initialDrawerPosition" option so the drawer starts in the position you'd like.
• Added a programmatic example for initialDrawerPosition in AppDelegate.
• Fixed a constraint issue in the Interface Builder example.
• Made the PulleyPosition.all accessible outside of the module

Fix tapping in dimmed area not dismissing drawer

1.2.2

Fix issue where tapping in the dimmed area doesn't dismiss the scroll…

Fix a crash from layouts

1.2.1

Update podspec version.

1.2.0

Added support for 'supported drawer positions' so that drawer content view controllers can enable / disable drawer positions.

1.1.0

Update README.md to remove Swift beta line