Better handling of namespace validation to fix a number of issues

- Fixes a bug which allows for underscores at the beginning of namespaces: Fixes #1849
- Allows dots and dashes for newer Docker clients: Fixes #1188
- Has the UI display better messaging associated with namespace entry

static/js/pages/new-organization.js

@@ -54,9 +54,9 @@
     };
 
     $scope.createNewOrg = function() {
-      $('#orgName').popover('hide');
-
+      $scope.createError = null;
       $scope.creating = true;
+
       var org = $scope.org;
       var data = {
         'name': org.name,
@@ -96,9 +96,6 @@
       }, function(resp) {
         $scope.creating = false;
         $scope.createError = ApiService.getErrorMessage(resp);
-        $timeout(function() {
-          $('#orgName').popover('show');
-        });
       });
     };
   }