Upgrade tutorial to truffle v3

[daithi-coombes]

This means figuring out our own build for the front-end webserver side of things.

To give some info on the issue - tuffle v3 is not backward compatible with v2 mainly because they dropped the default webserver. In order to upgrade this repo we would need to add our own build for the webserver, then refactor any code if needed.

[daithi-coombes]

Had a quick look (look only). Think our first issue is to get the artifacts into somewhere that the webservers front end javascript can read, ie a /public folder.

Webpack maybe the best tool for this. Open to suggestions.