barentsen/k2mosaic: v2.0.0

K2mosaic v2.0 is a major revision which changes the interface and adds the ability to list target pixel files and create videos. The k2mosaic command-line tool is now composed of three sub-commands: tpflist, mosaic, and video:

• k2mosaic tpflist {{CAMPAIGN}} {{CHANNEL}} lists all the Target Pixel Files (TPFs) for a given campaign and channel.
• k2mosaic mosaic {{TPF_LIST}} takes a list of TPF paths/urls and turns them into a mosaicked image (one FITS file per cadence and channel).
• k2mosaic video {{MOSAIC_LIST}} takes a list of mosaics produced in the previous step and collates them into an MPEG-4 movie or animated gif.

This is also the first version to be accompanied by sphinx-powered documentation, hosted as http://k2mosaic.geert.io.