Added the ratio plots, updated k-values, fixed some cosmetics
Merge pull request #90 from senkin/ratio_plots_etc

Added the ratio plots, updated k-values, fixed some cosmetics
added new ntuple_info script
small fixes
updating rootpy
added cross checks for fitting
Added function for cleaning the control region, adjusting the histogram boundaries, and calculating the best minimum and maximum
added roofit examples
first draft of a simultanous fit
updated rootpy
added new tests to travis config
added a new fitter, Minuit, to the list of fitters for the measurement. Also fixed a few minor things with the fitting
 - loosened requirements for Minuit testing & simultaneous fit
 - added ROOT 6.00.00 and removed ROOT 5.34.14
 - changed ROOT build location from senkin to kreczko
fixing test for ROOT 6
updated links to root builds
updated external software (submodules)
fixed TopAnalysis for ROOT 6
first step towards replacing single var fitting; all further commits will me merged
removed TMinuit from fitting script
finilising the implementation of multi-var fits