Merge pull request #113 from poupotte/master

Update install controller
Changed: uninstalling CouchDB also uninstall its dependencies. Close #108
Merge pull request #114 from jsilvestre/master

Changed: uninstalling CouchDB also uninstall its dependencies
Update README.md
Fixed: nodejs was always reinstalled
Changed: remove indexes/ during indexer update
Removed: provisionning is not mandatory anymore
Added: instructions to upgrade controller to v2.0
Merge pull request #115 from jsilvestre/master

update-devenv.sh fixes
Update README.md