Creates an extension bundle.
An extension bundle is a collection of webgen extensions. This task can either create a local bundle (in the
ext directory of the current website) or a bundle which can be distributed via Rubygems.
Public Class Methods
Create an extension bundle with the given name and of the given type (either :local or :gem).
If the type is :gem, the directory in which the bundle should be created can optionally be specified.
true if the bundle has been created.