TGen user page additions. Check my formatting, I think I got it right...?
Needed space in begining as to not ital, also fix AAC url/name
fixed some words
fixed some words
I love git

Merge branch 'master' of https://github.com/caddymob/bcbio-nextgen

Conflicts:
	docs/contents/introduction.rst
that'd be plural, guy
Added McKnight, Dell URL, and a slight tweak to last sentence. Good to go!
Merge pull request #398 from caddymob/master

Added TGen to users page