DOC: Remove reference to bipy

The pyqi URL was pointing at bipy, now points at biocore.
Merge pull request #399 from ElDeveloper/from-biolopy-import-bipy-as-skbio

DOC: Remove reference to bipy
Merge branch 'master' of https://github.com/biocore/biom-format into more_table_numpydoc_love
Minor corrections