Avoid unnecessary permissions lookups (thanks rchady!)

Author: root

lib/redmine_gitolite/admin_repositories_helper.rb

@@ -279,8 +279,8 @@ def build_permissions(repository)
       read   = []
 
       rewind_users = users.select{|user| user.allowed_to?(:manage_repository, project)}
-      write_users  = users.select{|user| user.allowed_to?(:commit_access, project) && !user.allowed_to?(:manage_repository, project)}
-      read_users   = users.select{|user| user.allowed_to?(:view_changesets, project) && !user.allowed_to?(:commit_access, project) && !user.allowed_to?(:manage_repository, project)}
+      write_users  = users.select{|user| user.allowed_to?(:commit_access, project)} - rewind_users
+      read_users   = users.select{|user| user.allowed_to?(:view_changesets, project)} - rewind_users - write_users
 
       if project.active?
         rewind = rewind_users.map{|user| user.gitolite_identifier}