Pyspeckit

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* Added cross-correlation
* Added (some) unit tests
* New interactive slider widget for manipulating models (Spectrum.specfit.add_sliders())
* Subtle but very significant bug-fix: parinfo is now a single uniform
list, based on the ParinfoList class.
* You can now fit based on what you see by using the 'use_window_limits=True' kwarg
.. warning:: This changes the default behavior in interactive mode!
* lmfit-py can now be used for fitting via the 'use_lmfit' kwarg
* BUGFIX: SpectroscopicAxis can be converted between units even when scalar
* velocity frames are read from FITS headers following the VELDEF conventions

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* H2CO fit / plot wrapper
* bugfixes
* setup.py no longer tries to write config files

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* Added GBT (GBTIDL SDFITS file) and ALFALFA (ALFALFA idlsave .src) readers
* added extinction model (just a function, not a complete model yet)

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* removed setuptools & distribute (they fail)
* added hydrogen.py to models
* first release to inherit from astropy's Spectrum1D

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* some internal cleanup / refactoring
* override slicing (__getitem__ features)
* parallel moment & fitting in Cubes repaired

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* added MIT license, moved mpfit and parallel_map inside pyspeckit as
* submodules