Update PROJECT_README.md with updated command

fab copytext.update -> fab text.update
Update FB promo image details
--no-site-packages has been virtualenv default since 2011-11-30
Emerson isn't here anymore
port over fixed deployment command from songs. closes #492
edit default tickets for house social media stuff. closes #495
Merge pull request #424 from brentajones/master

Update PROJECT_README.md with updated command
Merge pull request #491 from richardcornish/master

--no-site-packages has been virtualenv default since 2011-11-30
basic fab command for running gunicorn
Minor tweaks to gunicorn integration.
Merge latest master.