Completed the method "simulate" (I'm still not very sure if I understand correctly how programs in "game_theory_models" work. Please let me know if you find a problem.)
Added the "sequential" mode to the "play" method + fixed a tiny(but crucial) error in the "simulate" method.
Some variable names changed
Implementation modified
Added the plain docstring to "LocalInteraction" class. I'm glad if you proofread it.
Implementation of `play` changed
Merge branch 'localint_ya' into localint_ya_rev

Conflicts:
	localint.py

Changes in docstring incorporated
Docstrings elaborated

current_actions_mixed dropped, which is for internal use
Merge pull request #6 from oyamad/localint_ya_rev

New implementations in `play` and others/elaborated docstring