fixes issue #163. junit dependency definition on amp-archetype, I removed it where unnecessary (while keeping junit in the test build scope)
commented alfresco.client.war.version, which defaults to alfresco.version
added documentation for issue #163
changed Alfresco private repository id to alfresco-private-repository, in order to be compliant with http://docs.alfresco.com/4.2/tasks/dev-extensions-maven-sdk-tutorials-configure-maven-enterprise.html (issue #163)
Fixes issue #164, merged pull request #216

- -Penterprise is now added and SDK will run against latest alfresco
enterprise
- currently Alfresco INTERNAL only (no Enterprise SNAPSHOTs published)
- tested with latest Enterprise HEAD and also aligned artifactId to new
naming (alfresco-enterprise|share-enterprise)
- updated docs


Merge remote-tracking branch 'origin/enterprise-profile'

Conflicts:
	archetypes/alfresco-allinone-archetype/src/main/resources/archetype-resources/pom.xml
	archetypes/alfresco-amp-archetype/src/main/resources/archetype-resources/pom.xml
	archetypes/share-amp-archetype/src/main/resources/archetype-resources/pom.xml
	poms/alfresco-sdk-parent/pom.xml
	poms/alfresco-sdk-parent/src/site/apt/sdk-profiles.apt.vm
	src/site/apt/prerequisites.apt.vm