Write initial docs
minor corrections (typos)
Added API section
Enabled Sphinx nitpicky mode
Added Sphinx extensions
Merge pull request #2 from keflavich/initial-docs

minor corrections (typos)
store bunit in metadata
added unit conversion to a lot of functions
unit(1) instead of 1
whoa u.one is fast
u.one -> u.dimensionless_unscaled
strip data units if data come in with units (let spectral_cube handle
them).  Relative import in tests.  Use check_endian'd data if it's
checked.
fixed bug: _get_filled_data should *not* return a Quantity, whereas
filled_data should
Fixed API links
Separate out sections into different pages
Use latest astropy objects.inv to fix API links
Improvements to docs
Fix typos
Merge pull request #15 from astrofrog/initial-docs

Write documentation
Added RTD pip requirements file