Add methods for adjusting p values

[cjprybol]

This is currently available in Julia via https://github.com/dirkschumacher/PValueAdjust.jl

Given that the functionality for calculating p values lives here in HypothesisTests, I thought it would be a good idea to try and implement Bonferroni, FDR, and FWER methods here as well. I saw open pull requests related to p values here #73 and here #76, but nothing for these simpler tests.

Mainly posting this here as a reminder to try and implement these myself, but any feedback on whether these already exist in JuliaStats and I missed them, that these tests should go elsewhere, or thumbs up/down voting that moving this functionality out of a the PValueAdjust package and into here is a good/bad idea is welcome

[ararslan]

I've been meaning for a while to add p-value adjustments here, I just haven't gotten around to it.

[cjprybol]

https://github.com/juliangehring/MultipleTesting.jl

[ararslan]

Good find, thanks Cameron.