reshape code so that the figures can be re-used in other modules (class based plotting, add input loading function to read inputs files), split the code in different files (utils.py for utilities, figure.py for plotting related classes, commands.py for click commands). Change some click command defaults (nbins:  instead of 20, tablefmt:  instead of ), add click functionalities for a greater control of the plots (e.g. min/max axes values) and a nicer default visual. Fix the documentation and modify user guide according to the changes.

Add measure scripts: metrics (HTER, EER), roc, det, epc, hist (score histograms) and evaluate (that generates all the previous at once). Scripts can be called using  with xxx = roc for example. Add tests for those scripts.

Generic loading input file

See merge request !50

Moving biometrics-related functionality to bob.bio.base

See merge request !49

recompute far values in roc_for_far

Closes #27

See merge request !48

Add the expected output file for tests

See merge request !47