Plugging in new template languages

The tutorial is outdated because of the grokcore spin out of Grok 0.14. GrokTemplate and counterparts now live in grokcore.view and not grok components.

Awaiting permissions to make the change on the Grok website.

8th Sept 09
* Permissions granted. Will may changes over next couple of days and submit for review.

22 Sept 09
 * Retested failed tutorial example in with Grok 1.0b2.
 * Updated code to work with spun out grokcore.view components and interfaces
 * Retested and confirmed working
 * Updated code and text (with additional clarification following comments from 'activus')
 * Submitted changes and labelled accordingly.

24 Sept 09
 * Tutorial expanded by Uli F to include example template engine
 * Proof read by Paul W - spotted minor grammatical issue and fixed it.