Bringing data points on top of histogram bars in the fit results plots so that they can be seen.
Outputting correlation coefficients from fit procedure.
Adding print statements to output from 01_get_fit_results.py so that when the output is written to a file, the file can later be navigated to find the correct values to plot the correlations.
Script 98_fit_cross_checks.py to produce correlation plots from output from 01_get_fit_results.py.
Adding the sum_data values for each individual bin in the fit_results table (was previously just adding the total sum_data in the final column).
Merge pull request #52 from jjacob/master

Changes as detailed below
adding an example for RooFit, next one to follow
renamning examples/roofit.py
adding advanced RooFit example
adding expert RooFit example (what we need)
'adding' the holy grail of RooFit
a few fixes
adding RooFitFit to tool/Fitting.py and a unit test for it
nicer format
adding RooFitFit tests to travis build (please write more tests!)
adding Paras' RooFit code
adding gaussian constraints to RooFitFit (and tests, of course)
adding constraints to example. Also some code for later (profile LL)
saving the result of the fit for later access (i.e. covariance matrix)
adding fitter option
fixing master