Add CMS Preliminary and polish plots
Don't use PGF
Don't use PGF
Merge branch 'dev/limits'

* dev/limits:
  Don't use PGF
Merge branch 'dev/yields'

* dev/yields:
  Change reporting of bkg errors
  Add low-stat conditions
  Add ability to specify channel
Merge branch 'dev/plots'

* dev/plots:
  Don't use PGF
  Add CMS Preliminary and polish plots
Extend 4l st range
Fix bkg error calculation