0.10.0: Faith's PD and bug fixes

New Features:

• High-performance calculation of Faith's PD. See PR's #65, #70 and #93.

Bug fixes:

• Segmentation faults were occuring in ssu depending upon the order that threads started
  execution. See #63. This issue has been fixed.

0.9.3 checkpoint release

Incorporating API examples, and improved error checking.

0.9.2 conda build support

Update setup.py

0.9.1, conda-build support

Update setup.py

0.9.0 UniFrac release

Update setup.py

state UniFrac

Merge pull request #38 from ElDeveloper/edge-cases

Port edge cases from skbio