post_process_mcmcs

Merge pull request #2 from Uendert/master

Added py3 fixes

Created Readme.md

Bugfix for write-out of bestfit file (now it can be read in completely by Monte Python).

Modified write_parameter_table.py so that it writes out a model_name.bestfit file as sometimes required by MontePyhton for starting new runs from the best-fit.