Script which modifies runpath

Makes it much easier to test code since the package doesn't need to be
installed for the tests to work. Just prepend the cli-command with the
path_run.sh-script
Fixes small errors from the refactoring

oictest/__init__.py imported flow2sequence from the old location.
Changes import to new location in oauth2test.

Adds check for when output-parameter is None in Check.__call__().
Merge pull request #2 from asheidan/feature/run_script

Script which modifies runpath
Merge pull request #3 from asheidan/hotfix/refactor-fixes

Fixes small errors from the refactoring
Fixed some remaining half finished things after the latest refactoring.
Refactoring: oidc_response -> protocol_response

Makes the name easier to understand without referring to the
implementing class' documentation.

Also moves this member variable to the base-class
(rrtest.tool.Conversation) and adds docstring for the variable.
Merge pull request #4 from asheidan/refactor/protocol_response

Refactoring: oidc_response -> protocol_response