v2.7.0

v2.7.0, 2017-03-17

New strategies, increased test coverage, refactor of some tests, documentation
and minor bug fixes.

• New strategy: VeryBad
  #869
• New strategy: Resurrection
  #865
• Documentation of docstring requirements for contributions
  #872
• Refactor tests:
  #875
  #907
  #908
  #909
  #911
  #914
• Improved coverage:
  #899
  #900
  #901
  #902
  #904
  #905
  #910
• Bug in plot:
  #897
• Bug fix in deterministic cache:
  #882
• Bug in average copier:
  #912
• Minor function rename:
  #906

Here are all the commits for this PR:
v2.6.0...v2.7.0