0.29.0

• Added optional childProps hash to the Router. If this is specified, these props will be passed to all
  handlers, contextual routers, and their children. Props defined on a handler or Route directly have priority.
  This fixes #104.
• Possibly Breaking Change/Bugfix:
  • We allow passing an actual element as a handler, not just a component. Previously, props on these
    elements were lost, so that <Location handler={<div className="foo" />} /> would render <div></div>.
    This was unintentional and these inner props are now preserved and have priority over childProps or
    properties defined on the Route.