Merge pull request #51 from jjacob/master

Changes to be able to run scripts with new rootpy/matplotlib and some small corrections
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).