Add new v3 master with v2 forms, with colander/deform

goal here is to replace FormAlchemy dependency, slowly but surely..
so far only the Settings and Stores views use v3 master

tailbone/static/css/forms.css

@@ -54,6 +54,7 @@ div.field-wrapper.error {
 }
 
 div.field-wrapper label {
+    color: Black;
     display: block;
     float: left;
     width: 15em;