Bump version to 0.2.1
Fix compatibility with jQuery 1.9

* Removed $.browser dependency in liveUpdateUi
* Added temporary shim file that restores some $.browser behavior, to support legacy libraries like jQueryUI 1.8.x
Add option to disable tags in the UI, 'tagsEnabled'; defaults to true
Add options to disable the timestamp, 'timestampEnabled', or the byline, 'bylineEnabled', in the UI; both default to true