Tweak to readme
Fixed bugs related to zero point
Tweak to marking of catalog stars
Fix bug in HTML output for zero point
Made read_header work even if read_image has not yet been run
Required 100 stars for zero point calculation otherwise skipped
Fixed bug where flags would not be turned off on second evaluation if they should have been
Optionally specify filter for association in run_SExtractor
Adding Vizier query using astroquery
More work on zero point.  Changed calculation to use mode like FWHM and ellipticity.  Also changed plot
Improvements to make_zero_point_plot and measure_zero_point
Fixed bug in get_catalog
Added timing calculation to some methods
Separated timing measurement of zero point calculation and plot
Changed zero point plot to be gaster and better info
Bug fix in thresholding of zero point
Tweaks to plots and jpegs
Tweaks to histogram plots
Bug fix in run_SExtractor
Added expand user functionality to reading of config files.  Also moved DISTORT_DEGREES to telescope configuration rather than option in run_SCAMP method.