DOC-1109: roles and personas material
Merge branch 'master' of git.eucalyptus-systems.com:documentation
DOC-1109: removing the term 'personas' and streamlining accordingly.
DOC-1109: adding/modifying concepts and tasks for roles
DOC-1109: incremental commit
DOC-1109: roles stuff
DOC-1153: deletions and edits.
Merge branch 'master' of git.eucalyptus-systems.com:documentation