Added a new 'flushable = True' argument to the 'property_depends_on' decorator to allow properties to be explicitly flushed (using normal trait assignment). This is a feature requested by Peter Wang.
Added a new 'flushable = True' argument to the 'property_depends_on' decorator to allow properties to be explicitly flushed (using normal trait assignment). This is a feature requested by Peter Wang.

burnpanck/traits,burnpanck/traits