Fixed typo in cos.py.  Now if no row is found in the fluxtab, unity fluxcal is done
Added check on number of rows in TDSTAB.  Defaults to unity if no row for the mode
Modified io to recognize the lightcurve output with new column names
Typos
Remove support for multiplication,division,subtraction, and addition of floats
No longer need ci directory for travis-ci
added initial sphinx docs
Modified unittests to reflect new operation rules
working docs!
increment version number
added version module, along with passing versions of lightcurve,numpy,scipy,astropy and file generation date to headers on write
Divided flux by number of pixels to get correct units
Added checks for returning unity in TDS and FLUXCAL if no events are found in given selection criteria
Added a little documentation
removed _build from commits
Added install, intro, usage sections to docs
Made airglow filtering slightly more expandable to different modes
excluded _build dir for docs