Moved a lot of code into proper classes and modules, redesigned
the package format to just be proper python classes that extend
or instantiate the new base Package class which does all the
build work. Everything is much simpler and more extensible now.
Implemented a more flexible and simple system for building dependencies
that will be able to more easily build Mono and GTK, which is not as
straight forward as the other dependencies. Also a lot easier to maintain
and update the dep stack.
Should also be possible to extend the OS X profile to build a true bundle
for Linux as well. Would be an interesting hack.
