added script for copying the header files and platform-specific library
(.a file) into Products/MBToolbox/*

we'll need this stuff in a predictable place in order to lipo the
universal binary together
ignore the Products directory; this will be dynamically
generated during the build process
added script to build a universal library

this will allow directly linking against Mockingbird without
needing to embed the project file
add a mechanism to build a universal library