Fix trie import
Merge pull request #1561 from ElBrogrammer/did-you-even-trie-brah

Fix trie import
no cog yay -- oh god why...
Update to depend on scikit-bio 0.1.1.
Resolves some incorrect documentation

Resolves incorrect documentation and some commented out imports.
Merge pull request #1563 from ElBrogrammer/skbio-0.1.1

Update to depend on scikit-bio 0.1.1.
changed cogent imports to skbio
Merge pull request #1564 from johnchase/ports

changed cogent imports to skbio
Use skbio's ANOSIM and PERMANOVA methods
Merge pull request #1566 from ElBrogrammer/skbio-anosim-permanova

Use skbio's ANOSIM and PERMANOVA methods
Merge pull request #1562 from ebolyen/issue1541

no cog yay -- oh god why... UPGMA removed.
Merge branch 'master' into test_port

Conflicts:
	qiime/stats.py
	tests/test_stats.py
Adds z, f, chi2 dists

This commit adds functions for computing the normal, F, and chi-squared distributions to qiime.stats and removes depednence on skbio.math.stats.distribution.
Update t-test

Update t tests to use scipy.
Remove old code