LRDOCS-928 Update archetype generation for EE repo

Hey Jim,

I updated the Maven content with Mika's workaround for accessing the Liferay EE repo. I noticed that the [ARCHETYPE-204](http://jira.codehaus.org/browse/ARCHETYPE-204) ticket was filed in 2008, so we may be stuck using this workaround for a long time. This will give us a definite generation option for EE artifacts.

Thanks!