Address a few super-minor stylistic nitpicks and added a few additional docstrings.  I'm a little confused as to why the 'inverse' property didn't automatically get a docstring through InheritDocstrings.  It makes sense for input and output since their docstrings are provided in a way that only makes sense to Sphinx (though InheritDocstrings could, in principle, be fixed to support that too....)
Address a few super-minor stylistic nitpicks and added a few additional docstrings.  I'm a little confused as to why the 'inverse' property didn't automatically get a docstring through InheritDocstrings.  It makes sense for input and output since their docstrings are provided in a way that only makes sense to Sphinx (though InheritDocstrings could, in principle, be fixed to support that too....)

stargaser/astropy,kelle/astropy,MSeifert04/astropy,stargaser/astropy,astropy/astropy,tbabej/astropy,tbabej/astropy,lpsinger/astropy,astropy/astropy,joergdietrich/astropy,MSeifert04/astropy,pllim/astropy,mhvk/astropy,mhvk/astropy,saimn/astropy,larrybradley/astropy,mhvk/astropy,bsipocz/astropy,bsipocz/astropy,lpsinger/astropy,astropy/astropy,kelle/astropy,aleksandr-bakanov/astropy,tbabej/astropy,bsipocz/astropy,dhomeier/astropy,funbaker/astropy,aleksandr-bakanov/astropy,kelle/astropy,astropy/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,joergdietrich/astropy,dhomeier/astropy,stargaser/astropy,saimn/astropy,dhomeier/astropy,tbabej/astropy,astropy/astropy,saimn/astropy,larrybradley/astropy,kelle/astropy,larrybradley/astropy,saimn/astropy,funbaker/astropy,aleksandr-bakanov/astropy,AustereCuriosity/astropy,DougBurke/astropy,pllim/astropy,MSeifert04/astropy,funbaker/astropy,mhvk/astropy,larrybradley/astropy,AustereCuriosity/astropy,kelle/astropy,larrybradley/astropy,funbaker/astropy,bsipocz/astropy,joergdietrich/astropy,lpsinger/astropy,pllim/astropy,stargaser/astropy,dhomeier/astropy,StuartLittlefair/astropy,tbabej/astropy,mhvk/astropy,pllim/astropy,joergdietrich/astropy,pllim/astropy,AustereCuriosity/astropy,AustereCuriosity/astropy,DougBurke/astropy,dhomeier/astropy,AustereCuriosity/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,DougBurke/astropy,joergdietrich/astropy,lpsinger/astropy,saimn/astropy,DougBurke/astropy,MSeifert04/astropy