FIX: added coverage html report to ignored file
Merge branch 'development' of https://github.com/automl/HPOlib into development
ENHANCEMENT: add directed acyclic graph for issue #36
Merge branch 'development' of https://github.com/automl/HPOlib into development

Conflicts:
	HPOlib/format_converter/configuration_space.py
FIX revert merge mistake
Merge branch 'development' of https://github.com/automl/HPOlib into development
ENHANCEMENT: added pyll writer #3 #36
FIX import error