Replaced dead link (http://rob.conery.io/helpy-stuff/and-i-shall-call-it-massive) to go to Github repository (https://github.com/robconery/massive).

Fix capitalization of commandType (for copy/paste junkies)

It seems worth mentioning explicitly if Dapper works with PostgreSQL or not. I assume it does based on the remark that "it works across all .net ado providers", but am not sure because it's not mentioned explicitly...

Seems to me like xapfest.com domain is dead so removing it from Readme file