Merge pull request JuliaStats#31 from JuliaStats/err

FisherExactTest bugfixes and catching up with base

HypothesisTests v0.2.8 [86fec5d]

HypothesisTests v0.2.7 [d6e1f95]

HypothesisTests v0.2.6 [f3c63af]

HypothesisTests v0.2.5 [075d208]

HypothesisTests v0.2.4 [80c6eba]

HypothesisTests v0.2.3 [841cf1e]