Code updates to support a new weatherobject element called precipitationUnits. For the 'forecast' and 'hourly' UI, the weather module will use this new element if it is not null (i.e. a provider has pushed some value into this object element). If the element is null, then default 'units' processing will still occur. This allows a provider to have a customn unit of measure for precipitation - e.g. Env Canada will use mm for rain and cm for snow.
