Included commands for other OSes and DBs.  Touched-up intro paragraph.
Fixed link to msysgit.
Expanded the info about databases, clarified the performance tips, and touched up some text.
Added link to the deployment YouTube video.
Include tmp directory (but not its files) to avoid first time docpad run error.
Merge pull request #1 from RobJohnston/master

Added info for other OSes and DBs. Added link to deployment video. Clarified text in some areas.