Fix definition of major and minor axis (missing factor of 2)
Allow PPStatistic and PPVStatistic to accept structures to make it easier to programmatically explore the statistics without creating a full catalog.
Fix API links
Don't make wcs_origin a user parameter - it should always be 0 since astrodendro uses Numpy indices - making it a user option will confuse people since even if the data comes from a FITS file, origin should be 0.
Added example of over-plotting ellipses in documentation
Added PPStatistic and PPVStatistic to API page
Expanded docs on analysis
Changed sky_maj/min to sky_major/minor_sigma and keep revert changes to make them the full-width back to having them be the standard deviation.
Make statistics into properties
Changed sky_deconvolved_rad to sky_deconvolved_radius
Updated example to convert sigma to FWHM
Fixed API links
Merge pull request #39 from astrofrog/overlay-plotting

Improved analysis API to make it easier to use programmatically