Updated Links in readme

The links in the readme were giving a 404. Since it looks like the project had moved, I updated the links to the knockout-contrib org  (from the ericbarnard org) and they appear to work correctly now.
Updating readme to correct link

Found one more link -- the Custom Cell Template Library wasn't pointing to the knockout-contrib link.
merging the README
Merge branch 'SeanKilleen-master'
Merge branch 'master' of https://github.com/Knockout-Contrib/KoGrid