NF+BIG+WEB: add functionality to show git commit summary for last month on web documentation
BLD+NF: add test functions to rst building
WEB+SML: add title line to cosmo2013
WEB+SML: add test and demo to modindex in cosmo2013
SML+WEB: fix typo in link
EXC+WEB: update nn classifier example to show new knn classifier solution
TST+SML: remove superfluous newline
TST: use more samples in doctest
EXC+DOC: add simpler (but less efficient) alternative code to show workings of nn classifier