Bug 849908 - Handle alarm offsets
Bug 851446 - make purge to remove all webapps dir, disregard GAIA_INSTALL_PARENT, r=fabrice
Bug 851860 - fix syntax error?
Bug 825678 - update algorithm for ValuePicker

The original implementation updates the status of ValuePicker
whenever it gets mouse-move event, and it loses information
of initialization of dragging.

To update the implementation to track needed information when we
are dragging.