Merge pull request #187 from gregcaporaso/death-march

updated documentation for pyqi 1.1.3
Update setup.py to install new modules

Also checks for pyqi library. Fixes #166.
Update citation in setup.py
Merge pull request #190 from jrrideout/death-march

Update setup.py to install new modules
Update biom validate-table command in docs
Update 1.1.3 refs to 1.2.0

1.1.2-dev refs still need to be updated
Update version strings: 1.1.2-dev to 1.2.0
Merge pull request #196 from jrrideout/death-march

Updating version strings: 1.1.2-dev/1.1.3 to 1.2.0
Add R biom package link to docs
Merge pull request #197 from jrrideout/death-march

Add R biom package link to docs
fixes #189