no cog yay -- oh god why...
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.