Merge pull request #3 from bcassell/master

the old pull request plus sequential module
Added sym_2p2s() to RandomGames.py and refactored slightly.

sym_2p2s() creates a random instance a specified game among the 12
ordinally-distinct 2-player, 2-strategy symmetric games. The refactor
added __make_symmetric_game() to mirror __make_asymmetric_game(), and
applied them both in various other functions.
Made sym_2p2s() compatible with Bootstrap.py.
Added some new noise interpolation points.

The results from u80b20 were interesting, so I wanted more.
Updated Bootstrap.py to accomodate.
fixed some bugs in evaluators