ENH: fixes #421
changed files in doctests to literal
MAINT: addressed @ElBrogrammer's comment to add something we don't use
Merge branch 'master' of github.com:biocore/bipy into issue-421
added note about this change
Merge pull request #438 from gregcaporaso/issue-421

added imports of common functionality to top level init for convenience of importing
Merge pull request #441 from ebolyen/issue439

Fixes #439