updated to most recent SourceTracker release

this includes some changes that will facilitate use with QIIME 1.7.0
modified env variable that gets set
Merge pull request #50 from gregcaporaso/st-0.9.5

updated to pull SourceTracker 0.9.5
Updated qiime-1.6.0-dev/qiime.conf and picrust-0.9.0-dev/picrust.conf to install R 2.12.2
Merge pull request #51 from dmdu/install_r_2.12.2

Updated qiime-1.6.0-dev/qiime.conf to install R 2.12.2
Reverted R version back to 2.12.0 for now.

PICRUSt and QIIME builds are often hanging indefinitely, and after discussing with @gregcaporaso, we decided to revert for now since we have a QIIME release on Monday. We can then look into the failures and upgrade the version after the release.

I'll do a bit more debugging on my end and post details in a separate issue.
Merge pull request #52 from jrrideout/r_version_revert

Reverted R version back to 2.12.0 for now.
Add emperor to the dependencies list

Add the emperor git repository so people can start using it right away
when they install QIIME.
Merge pull request #53 from ElDeveloper/emperor

Add emperor to the dependencies list
Adding galaxy and qiime-galaxy
Fixing Galaxy release-file-name
Fixing Galaxy version
Fixing Galaxy installation
Merge pull request #54 from josenavas/add_galaxy

Added Galaxy
Added conf files for QIIME 1.7.0 and 1.7.0-dev
Merge pull request #55 from jrrideout/170

Added conf files for QIIME 1.7.0 and 1.7.0-dev
Changed pyzmq version to work with latest IPython.
Merge pull request #56 from jrrideout/pyzmq-fix

Changed pyzmq version to work with latest IPython.
Added support for the R biom-format package.

These changes are necessary for the CI system to test this part of the biom-format project.
Merge pull request #58 from jrrideout/r-biom

Added support for the R biom-format package.