REFACTOR: Clean up argparser
Require python version 2.7
FIX: Checking whether benchmark is callable

HPOlib does now only accept absolut paths to python modules
or paths relative to config.cfg
FIX Check if path to function exists

Do not import it as a python module anymore
Merge branch 'development' of https://github.com/automl/HPOlib into development

Conflicts:
	HPOlib/check_before_start.py