sdss/marvin: Marvin Beta 2.2.0

This release is a new minor release of Marvin Beta which includes support for MPL-6.

• Added Maskbit class for easy conversion between mask values, bits, and labels.
• Better BPT documentation, in particular in the Modifying the plot section.
• A hack function marvin.utils.plot.utils.bind_to_figure() that replicate the contents of a matplotlib axes in another figure.
• New scatter and histogram plotting utility functions
• Integrated scatter and histogram plotting into query Results
• New methods for easier query Results handling
• New Pythonic DRP, DAP, and Query DataModels
• Access to DAPall data

• Issue #190: Maps.get_bpt() and marvin.utils.dap.bpt.bpt_kewley06() now also return a list of axes. Each axes contains a method pointing to the marvin.utils.plot.utils.bind_to_figure() function, for easily transfer the axes to a new figure.
• All Cubes, Maps, and Modelcubes use Astropy Quantities
• Refactored to the Bin class
• Bin and Spaxel are now subclassed from SpaxelBase

• Issue #24
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