remove python targets and unnecessary R targets

Fixes https://github.com/qiime/qiime-deploy/issues/55 and #97.
Merge branch 'master' into qiime-deploy-issue-55

Conflicts:
	qiime-dev/qiime.conf
Merge pull request #99 from jrrideout/qiime-deploy-issue-55

remove python targets and unnecessary R targets