feat: bring back m.route.params()

Because it's annoying only having route params available to the
top-level components within a route.

api/router.js

@@ -54,6 +54,10 @@ module.exports = function($window, redrawService) {
 			route.set(href, undefined, undefined)
 		}
 	}
+	route.params = function(key) {
+		if(typeof attrs !== "undefined" && typeof key !== "undefined") return attrs[key]
+		return attrs
+	}
 
 	return route
 }

api/tests/test-router.js

@@ -1194,6 +1194,27 @@ o.spec("route", function() {
 						done()
 					}, FRAME_BUDGET * 2)
 				})
+
+				o("m.route.params is available outside of route handlers", function(done) {
+					$window.location.href = prefix + "/"
+
+					route(root, "/1", {
+						"/:id" : {
+							view : function() {
+								o(route.params("id")).equals("1")
+
+								return m("div")
+							}
+						}
+					})
+
+					callAsync(function() {
+						o(route.params("id")).equals("1")
+						o(route.params()).deepEquals({id:"1"})
+
+						done()
+					})
+				})
 			})
 		})
 	})