DOC: Make README.rst also LONG_DESCRIPTION
Add copy of all of BayesLogit
Squashed 'horizont/RNG/' content from commit d775bd8

git-subtree-dir: horizont/RNG
git-subtree-split: d775bd8a359f5e67b8c53a32ecad7239226d9a83
Merge commit '9038e1b85299593d2bcbf46b0aa07bb423ce1d91' as 'horizont/RNG'
Minor fixes to Cython/BayesLogit wrapper
Comment out errant RPrintf from BayesLogit code
Add Pólya-Gamma sampler horizont.random.pg
Merge branch 'feature/polya-gamma' into develop