NEXUS-6176: Describe page reasoning.

Rendering it now as before.
Also, group imple fixed, to retain processing order
in the reasoning map.

http://screencast.com/t/NC7X9skA

Issue
https://issues.sonatype.org/browse/NEXUS-6176

CI
https://bamboo.zion.sonatype.com/browse/NX-OSSF36