Merge pull request #2150 from edx/feanil/update_local_dev

.rbenv is a git repo don't change permissions.

playbooks/roles/local_dev/tasks/main.yml

@@ -16,12 +16,14 @@
   user: name={{ forum_user }} groups={{ common_web_group }} append=yes
   when: forum_user is defined
 
+# Need this in order for the forum user to install and uninstall
+# gems using 'bundle' or 'gem'.  Can't make it 760 because that
+# would break the bin directory under .gem
 - name: set forum rbenv and gem permissions
   file:
     path={{ item }} state=directory recurse=yes mode=770
   with_items:
     - "{{ forum_app_dir }}/.gem"
-    - "{{ forum_app_dir }}/.rbenv"
   when: forum_user is defined
 
 # Create scripts to configure environment