Async ViewsPlugin

ViewTemplates and EmailTemplates are async. Now it's possible to do asynchronous actions before rendering views or email templates. It's useful when views have layouts with dynamic contents like menu, ads, banner, etc.

This is my problem which is solved by this patch: https://groups.google.com/d/msg/securesocial/fHb3vsl-qBw/rexdWE9FF_4J