standardized datetime.{date,datetime} instance handling in update_flux
added some comments in the javascript. Now that I'm reviewing this again, I'm remembering some more details
renamed sparklines.js to sparkline.js

--HG--
rename : flux/static/flux/js/sparklines.js => flux/static/flux/js/sparkline.js
got a basic mouse hover working
got the styling to be better with the sparkline labels