0.5.12

###ES3-0.5.12
  - Router: when multiple handlers are attached to a given route, the
`$next` argument now works exactly like for handlers of different
routes ( you have to call $next to let the router invoke the next
handler)
  - Router: the default dispatcher function is now a static public
method of the class Router, instead of a private one.
  - namespace: $def/$define returns its value (so you can assign it to
a local var)
  - namespace: if the function used as a scope returns a value, that
value is assigned as the namespace value instead (which is both useful
and error prone :-)