Astrobase: Python modules for light curve work and variable star astronomy

Fixes in this release

• checkplot: add a short cp2png function for convenience
• checkplot/hplc: add gzip support
• checkplot, hplc, lcproc: fix binary mode opening for gzipped pickles
• checkplot: remove stray re-raise so things won't break if no finder
• fakelcgen.add_fakelc_variability: don't add variability if it exists
• fakelcgen: add generate_transit_lightcurve, add_fakelc_variability fns
• fakelcgen: add timecols, magcols, errcols to fakelcdict; transit stuff
• fakelcgen: finished up add_variability_to_fakelc_collection
• fakelcgen: fixed bugs in generate_[eb|flare]_lightcurve
• fakelcgen: fixing generate_transit_lightcurve
• fakelcgen: fix random declination range
• fakelcgen: handle non-variables in add_fakelc_variability
• fakelcgen/lcproc: chosen random mag -> scalar; feature arrays -> 1-d
• fakelcgen: use the correct bin count dist for random mag assignments
• hplc: read gzipped pklc transparently
• lcproc: add parallel_runcp for list of periodfinding result pickles
• lcproc: HP gzipped pklc glob update

Work that may be in progress

• [WIP] varclass.fakelcrecovery: TBD