fix issue 1695
minor comments edited
import from skbio 0.1.4
changelog merge conflict resolved
TST/REVERT: reduction of the runtime of the test, plus reversion of misguided attept at doing that yesterday
Merge pull request #1711 from gregcaporaso/issue-1710

TST/REVERT: reduction of the runtime of the test
ENH: updated to output raw data, still needs testing and code clean-up. fixes #1707
Merge pull request #1702 from ekopylova/fix_1695

fix issue #1695
TST: added test of new functionality
Merge branch 'master' of github.com:qiime/qiime into issue-1707
REL: added note to change log
MAINT: fixed typo
Merge pull request #1712 from gregcaporaso/issue-1707

added output of raw data for paired difference testing