Star detection modules has been rewritten from scratch.
  I hope its faster, more elegant and clearer now.
Some bug fixes on star detection module.
ObsPyephem now takes the correct datetime (from image, not from now())
Better algorithm to check if a star is detectable.
  We can now detect with certainty like 200 stars in AstMon-UCM images (tested on V band)!.
  Previously, if we detected >40, there was an important risk of false detections.
Some bug fixes on Bouguer Fit.

To be done:
 - Workaround on Star Map. Now, only the meridian can be shown due to a bug
   (matplotlib contour tries to close the curve and collapses all azimuth
   isolines in top of azimuth=0.)
 - Better choose between save or show in screen of figures.
 - Fix the Sky Brightness module (work in progress ...)
 - Make the first PyASB launcher to analize images.
First working version that makes:
 - Star Map plot (with alt-az grid, altough the algorithm could be more elegant).
 - Bouguer law fit.
 - Sky Brightness map, with contourf and contour.