Added enable function to schemas. This allows filtering of schemas
which is a required part of feature flagging in rancher. Added
addFeature functions to controller template for adding handlers that
can be disabled if their associated feature is disabled.
PostForm will ignore URL query parameters and will only look at the
body. This is much more useful for actions, which have a query param
that is the action name, but the a json body. WIthout this change,
the only "field" found when parsing an action body is the name of the
action.
When parsing URL paths, unescape them so that characters that needed escaped
in order to be placed in the a path segment are returned to their original
form.
