added Join Group button for joining public groups
Merge branch 'master' of https://github.com/sbsimo/geonode
Merge pull request #1438 from sbsimo/master

added Join Group button on the Group Detail Page
Added virtualbox instructions
VMware instructions.

Added VMware instructions fixes https://github.com/GeoNode/geonode/issues/1159
References the quick installation docs
Referenced the new name for custom installation
Referenced the new name for custom installation
Merge pull request #1439 from markiliffe/master

Preparing your environment documentation
bump to gsconfig 0.6.9
Merge branch 'master' of https://github.com/GeoNode/geonode
Added documentation to facilitate the sharing of maps.
Merge branch 'markiliffe-master'
Minor improvements to the sharing documentation.
Update production.txt
Update production.txt
Update production.txt
Merge pull request #1441 from assefay/master

Configuring GeoNode for Production notes
Added new authors.

Who opened PRs that were merged during the sprint in Rome.
added Simone Balbo to the list of contributors