updated INSTALL, and default always_check behaviour

uhh, add qq to always_check so it's silent so that when I run a cronjob for rollout to check for differences it doesn't always print the CMD prefix bits

updated INSTALL document to fix a basic procedure
added GFM markdown, and added extension to INSTALL (INSTALL.markdown)

Don't laugh too hard at all the stupid commits to get the formatting right, I know it's good now.  I'll also probably start a stupid side project for using the API at github to check markdown.