Add initial OSX build script
Fail if which fails to find dependencies
Implement OSX hook patching
Note the Xcode requirement
Implement initial OSX hook building
Target OSX 10.8

This needed because Qt 5.1.1 will not build for Mavericks (supposedly
Qt 5.2 would).
Only build qtbase
Build OSX hook out of the source tree
Add primitive (dev-only) OSX hook install script
Fixup framework library ID and path(s)
Merge branch 'osx'