Adding configuration for installing some features optionally
Adding Pyroma as an optional tool
Optional requirements must use _ instead of -, as when trying to install (pip install prospector[with-everything]) the hyphens get converted to underscores for lookup but do not warn about the optional extra not existing...
Fixing the test to see whether a test passed or failed. Pyroma messages return True if the test passed, False if it did not and None if it did not run, so the check should be 'result is False' instead of 'not result'