UFunc instances for other distributions.
now compute normalizer as well as logNormalizer
Fix Gamma at endpoint.
Made logNormalizer into lazy val.
Fix chisquared endpoint
Merge pull request #169 from stucchio/distributions_ufunc

Some tweaks to distributions
added Covariance and T Test in breeze.stats
Split tTest into overloads, fixed tests for FP roundoff.
Merge pull request #170 from joshuaar/master

added Covariance and T Test in breeze.stats
Merge branch 'master' into polynomial