Various updates
Various edits in late 2012. Cleanup and packaging improvements, misc
other.
added license, copied from pyfits
minor tweak to output formatting for imshow_with_mouseover
convert from UTF8 to plain ascii
documentation and packaging cleanup, improvements to FITSOpticalElement initialization
Implement non-square detector arrays in poppy, with unit tests to validate.
Implement improved/reorganized test suite, suitable for use with pytest.
Start a unified/cleaned up DFT code, but that's still a work in progress.
Further improvements for rectangular arrays including display, various
minor code cleanups, improved tests.