web: JsTests: oops, we actually need it to be a Page
web: Alternative `SimpleAjaxPage`
web: remove some printlns
web: split out SimpleAjaxPage, LiftAjaxPage, into separate files from AjaxPage
web: SimpleAjaxPage: stop timer when lift shuts down
web: Remove deprecated DomEventSource#propagateJS
web: SimpleAjaxPage: correct timing

Inadvertently committed it with a short time after debugging.
Really should be made configurable
web: Factor out the page weak reference cache into a reusable trait
web: SSE Page (SsePage)

Alternative to Lift comet
demo: Use SimpleAjaxPage and SsePage rather than Lift ajax/comet
web: scaladoc fix