acu96696 add info to warn people away from rolling their own gem when they really want a RightImage or package
acu96696 re-word docs a bit, add info on supported cloud types
acu96696 provide links to supportal
acu96696 zap extra files that got committed by accident
Merge pull request #192 from rightscale/teal_13_06_acu96696_release_notes

Make install doc a bit less misleading.