strip last path parameter in router's find method

To support Titan router must strip path parameters from last segment
of the path in find method. Otherwise paths like /foo;size=1 won't
match declared path /foo in router.

Path segment parameters are described in RFC 3986, section 3.3.

router.go

@@ -227,6 +227,11 @@ func (n *node) findChildByKind(t kind) *node {
 // find lookup a handler registered for path. It also parses URL for path
 // parameters and load them into context.
 func (r *router) find(path string, c Context) {
+	i := strings.Index(path, ";")
+	if i != -1 {
+		path = path[0:i]
+	}
+
 	ctx := c.(*context)
 	ctx.path = path
 	cn := r.tree // Current node as root

router_test.go

@@ -1210,6 +1210,14 @@ func TestRouterParam1466(t *testing.T) {
 	is.Equal("sharewithme", c.Param("username"))
 	is.Equal("self", c.Param("type"))
 
+	r.find("/users/sharewithme/uploads/self;mime=text/plain;size=24", c)
+	is.Equal("sharewithme", c.Param("username"))
+	is.Equal("self", c.Param("type"))
+
+	r.find("/users/sharewithme/uploads/self?foo=1", c)
+	is.Equal("sharewithme", c.Param("username"))
+	is.Equal("self?foo=1", c.Param("type"))
+
 	c = g.newContext(nil, nil, "", nil).(*context)
 	r.find("/users/ajitem/uploads/self", c)
 	is.Equal("ajitem", c.Param("username"))