Light curve

TODO: write a spec. how to store light curves in a table.

• Are there any standard formats for light curves? (e.g. a VO spec?)
• See monthly light-curves in the Fermi catalogs
• http://fermi.gsfc.nasa.gov/ssc/data/access/lat/4yr_catalog/ap_lcs.php
• See https://github.com/gammapy/gammapy/issues/281