Add help option prop types

Author: vidartf

js/scripts/generate-wrappers.js

@@ -813,6 +813,7 @@ class PythonWrapper {
 
         this.properties = _.mapObject(this.config.properties, function(prop) {
             return {
+                help: prop.options.help,
                 trait_declaration: prop.getTraitlet(),
                 defaultJson: prop.getPythonDefaultValue(),
             };

js/scripts/templates/autodoc.mustache

@@ -25,6 +25,10 @@
     {{#each properties as |prop propName|}}
     .. py:attribute:: {{ propName }}
 
+        {{#if prop.help}}
+        {{{indent prop.help '        '}}}
+        {{/if}}
+
         .. sourcecode:: python
 
             {{{indent prop.trait_declaration '        '}}}