Added validation for name: Should not include a http(s) url (#2114)

spec/models/user_spec.rb

@@ -27,6 +27,7 @@ describe User, type: :model do
   context 'validations' do
     it { should validate_presence_of(:name) }
     it { should validate_length_of(:name).is_at_most(256) }
+    it { should_not allow_value("https://www.bigbluebutton.org").for(:name) }
 
     it { should validate_presence_of(:provider) }