New statistics functions to compute weighted statistics and binned statistics in a little more friendly fashion with better stats computing, naming convention, and useability. Old functions remain for backwards compatability (until I get around to updating everything.)
New statistics functions to compute weighted statistics and binned
statistics in a little more friendly fashion with better stats
computing, naming convention, and useability. Old functions remain
for backwards compatability (until I get around to updating
everything.)

New functions are `compute_statistics` which handles weighted and
unweighted statistics and `binned_statistics` which computes the above
for one variable binned as a function of another.

aemerick/galaxy_analysis,aemerick/galaxy_analysis