CustomFields

- renamed form block type "input" to "text" for consistency with React
- updated CustomFields router to comply with main router
- unit tests for CF router

assets/js/src/subscribers/form.jsx

@@ -53,10 +53,6 @@ define(
 
     var custom_fields = window.mailpoet_custom_fields || [];
     custom_fields.map(custom_field => {
-      if(custom_field.type === 'input') {
-        custom_field.type = 'text';
-      }
-
       let field = {
         name: 'cf_' + custom_field.id,
         label: custom_field.name,