make upload permissions global

give upload image permission to registered users on install
add global privileges to app.user.privileges for client side use

src/privileges/helpers.js

@@ -221,3 +221,9 @@ helpers.getGroupPrivileges = function (cid, hookName, groupPrivilegeList, callba
 		},
 	], callback);
 };
+
+helpers.giveOrRescind = function (method, privileges, cid, groupName, callback) {
+	async.eachSeries(privileges, function (privilege, next) {
+		method('cid:' + cid + ':privileges:groups:' + privilege, groupName, next);
+	}, callback);
+};