Add initial Sphinx config.
Add autojs Sphinx extension.
Add docs folder to sys.path so that autojs is importable.
First docs.
Document interaction machine events.
Add class documentation for StateCreator.
Document StateCreator.on_event.
Add class docstring for InteractionMachine.
Docstrings for StateCreator methods.
Add a note that switch_state() may be overridden.
Document some InteractionMachine methods.
Use double-backticks for code.
Mark  as a class in set_user_answer docstring.
Fix a few more places where reference classes without giving them proper role markup.
Fix typo (missing space in creatorexists).
Mark references to IMEvent as js classes.
Merge branch 'feature/issue-37-sphinx-docs' into develop
Merge branch 'develop' into feature/issue-36-initial-changes-for-v02