Drop support for live collections
Drop support for live collections

As long as collections are kept up to date using DOM mofification,
events, the collections will never be garbage collected, as the
event listener holds a reference. Since this also doesn't work on
IE, I might instead add an explicit __update__ method.

foolip/microdatajs,matt-west/microdatajs,abernier/microdatajs,foolip/microdatajs