Commits on May 23, 2012

1. Add t-test with unequal variances, bug fix for edge case on all tests …

   Added method for t-test with unequal variances. ttest_ind assumes
   population variances are equal.
   
   Refactor common code in all 4 t-test methods to _ttest_ind_setup and
   _ttest_finish.
   
   Fix bug in all 4 methods. Previous implementation would, if the
   difference in means and the denominator of the t-statistic were zero,
   set the t-statistic equal to 1. If the difference in means is zero, the
   t-statistic should always be zero. Code and respective tests changed to
   reflect this.

   

   MrCreosote committed May 23, 2012
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