v2.13.0

v2.13.0, 2017-06-01

New strategies, refactor of strategy tests and minor documentation fixes.

• New strategy Dynamic Two Tits for Tat:
  #1030
• New strategy Eugine Nier
  #1016
• New strategies: trained FSMs, TF1, TF2, TF3
  #1036
• Small documentation fix:
  #1022
• Refactor of strategy tests:
  #1016
  #1021
  #1022
  #1023
  #1024
  #1028
  #1029
  #1030
  #1031
  #1032
  #1033
  #1034
  #1035

Here are all the commits for this PR:
v2.12.0...v2.13.0