NXCM-5412: New goals rc-list and rc-list-profiles

Initial implementation.
NXCM-5412: Improvements for initial imple

Changes:
* formatting improvements
* sorting
* filtering of released ones
NXCM-5412: Doco for two new mojos
Fixed typo.
NXCM-5412: ITs for two new goals.
NXCM-5412: Updated doco

To denote when was the goal added.
Merge pull request #54 from sonatype/nxcm-5412-rc-list-goals

NXCM-5412: New goals rc-list and rc-list-profiles