Major changes, see details

v0.1.2, 5/22/13 -- Changed directory structure. rlsolutions became
levelksolutions. The modules in rlsolutions are located in
levelksolutions.isnfg.
v0.1.2, 5/22/13 -- Fixed DecisionNode._createCPT so that DNs without
parents have first dimension of size 1.
v0.1.2, 5/22/13 -- Added levelksolutions.snfg. and
levelksolutions.snfg.levelk. This is where level-k best response
(bestresponse_node), level-k logit response (logitresponse_node), and
level-k d-relaxed (?) algorithms are located.
v0.1.2, 5/23/13 -- Added mceu to pynfg.utilities.utilities. It computes
the move-conditioned expected utilities for a decision node given the
game.
v0.1.2, 5/23/13 -- Bug fixes in SemiNFG.sample, DeterNode.prob,
ChanceNode.draw_value, ChanceNode.prob,
pgtsolutions.intelligence.coordinated and uncoordinated
v0.1.2, 5/23/13 -- New error handling in Node.get_valueindex
v0.1.2, 5/23/13 -- New internal structure for setting and getting node
values and valueindex.