Rao-Blackwell adaptive MCMC

[ben18785]

Addresses #917

[ben18785]

@MichaelClerx Any idea about this Travis error? Unexpected section title (referring to the 'references' bit of the docstrings).

[MichaelClerx]

For whatever reason it's not expecting a section title. Presumably it's still inside some other structure, like a list of bullet points or a code block or something? Should go away if you tidy up the bit above, add in the proper latex tags etc.

[codecov]

Codecov Report

Merging #970 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #970   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          61     62    +1     
  Lines        6196   6226   +30     
=====================================
+ Hits         6196   6226   +30

Impacted Files	Coverage Δ
pints/_mcmc/_rao_blackwell_ac.py	100% <100%> (ø)

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[ben18785]

@MichaelClerx Thanks!

[MichaelClerx]

Looks good, bunch of questions