[added] <Routes handlerProps = {…} >

Anything you pass into handlerProps will be passed as props into all
your handlers.

For instance:

	<Routes
		handlerProps = 	{
											{
												"favoriteFruit": "banana",
												"favoriteDrink": "smoothie"
											}
										}
	>
		<Route handler = { Trunk } >
			<Route handler = { Branch } >
				<Route handler = { Leaf } />
 			</Route>
		</Route>
	</Routes>

if Leaf was the active route; Trunk, Branch, and Leaf would all be
called with favoriteFruit and favoriteDrink as props, like so:

	<Trunk
		favoriteFruit = "banana"
		favoriteDrink = "smoothie"
	>
		<Branch
			favoriteFruit = "banana"
			favoriteDrink = "smoothie"
		>
			<Leaf
				favoriteFruit = "banana"
				favoriteDrink = "smoothie"
			/>
		</Branch>
	</Trunk>