Add SkipClean option

By default paths are run through the cleanPath method which prevents
using fancier paths like /fetch/http://xkcd.com/534

This adds a SkipClean option so that this path isn't redirected to
/fetch/http/xkcd.com/534

route.go

@@ -23,9 +23,12 @@ type Route struct {
 	matchers []matcher
 	// Manager for the variables from host and path.
 	regexp *routeRegexpGroup
-	// If true, when the path pattern is "/path/", accessing "/path" will
-	// redirect to the former and vice versa.
-	strictSlash bool
+    // If true, when the path pattern is "/path/", accessing "/path" will
+    // redirect to the former and vice versa.
+    strictSlash bool
+    // If true, when the path pattern is "/path//to", accessing "/path//to"
+    // will not redirect
+    skipClean bool
 	// If true, this route never matches: it is only used to build URLs.
 	buildOnly bool
 	// The name used to build URLs.