Merge pull request #56 from arielrossanigo/fix_fringe_order

Fix order in logged fringes
Merge pull request #57 from arielrossanigo/fix_explore_set

Fix explore set
No more need to have a childs temorary list, work directly on the fringe
Memory doesn't needs key-value, a set is enough now
Merge branch 'better-closed-list-and-childs-insertion' into develop
Up version for minor release
structure of reinforcement learning with tictactoe example
boltzmann exploration and some test
improve performance metrics
reuse argmax from search.utils
relax random test
fix variable learning rate