Merge pull request #29 from macoslib/master

Merge changes
Merge branch 'macoslib-master'
Merge pull request #30 from macoslib/master

Merge changes
Merge branch 'macoslib-master'
Modified WindowExtensions.ScalingFactor

- Replaced If's with #if's.
- Changed declare to soft declare as function was introduced after OS X
10.5.
- Updated version to 139.
Modified NSWindow, added example

- Added properties to NSWindow for BackingScaleFactor, DocumentEdited,
MovableByWindowBackgound,
  RepresentedFile, RepresentedFilename, and RepresentedURL.
- Added Constructor and Operator_Convert to NSWindow to allow
assignment of a native window.
- Added NSObject.RespondsToSelector method.
- Added NSWindowExample window.
- Modified convenience methods to take advantage of new NSWindow
properties.
Merge pull request #55 from ktekinay/master

Modified WindowExtensions.ScalingFactor