Updated link to Graphene guide from features page
Created structure for the Containers SPI Documentation
Added Getting Started Guide for Containers SPI

Issue: #70 #71
cleanup headings, fix author, refine wording
Added dependencyManagement section to the example POM

Collated the sections on container extension registration.
Issued corrections in the other sections.
Remove TODO, FIXME comments
Move Testing in the Cloud to "More Coverage"