Modified pycogent_backports/test.py to include new G test.
Added tests for G-Test and removed redundant functions.
Merge branch 'ocs_collab' of https://github.com/wdwvt1/qiime into ocs_collab

Merged changes from @lkursell and my own.
Merge branch 'ocs_collab' of https://github.com/wdwvt1/qiime into ocs_collab
Added more.