Adds build script for OS X dependencies, fixes#1112. OS X builds no
longer use MacPorts/Homebrew, check BuildInstructions.
Adds build script for OS X bundles. Adds OS X icon and DMG background
image.
Moves bundled libraries to libraries/source.
Moves most headers and precompiled static libs for Windows to
libraries/win32.
Updates Premake and packaging scripts to support this.
This was SVN commit r13148.
