Fix build issues

Closes #204. Tested under linux with bleeding edge. Tested both source installation and binary installation on Windows with minimum packages for Python 2.6, 2.7, and 3.2 32- and 64-bit. There is one problem with 2to3 on 32-bit only. For some reason it doesn't change `from linbin import fast_linbin` to a relative import. It does change the kalman filter one, so I don't think it has anything to do with the extension. Will have to check later. Changing this after it's installed, it tests fine.

There are some failing tests on Windows (probably versions dependent), but that's a different PR.