Feature Request: Customize class prefix via config

[scottadamsmith]

Out of the box all the classes are prefixed with "vf". If someone wanted to change that prefix to some other namespace to provide a bit more separation, they'd currently have to explicitly define every class in the config. And if new classes are introduced they'd have to add them as well. If we supported an override for the prefix of all classes and default it to "vf", this would provide the ability to change them all at once and have it scale as new classes are introduced in later updates.

Thoughts?