v2.12.0

v2.12.0, 2017-05-23

New strategies and internal refactoring/improvements

• New strategy Alexei:
  #997
• New strategy Stein And Rapaport:
  #1012
• Documentation fixes/improvements:
  #1020
  #1018
  #1013
  #1011
  #1005
  #1004
  #1003
• Internal refactoring:
  #1017
  #1015
  #1010

Here are all the commits for this PR:
v2.11.0...v2.12.0