Update jQuery to version 1.9.1
ajax-increment.scm: refactor using SXML
arc-challenge: refactor using SXML
The default value for undefine-page's method is '(GET HEAD)

That's to match the default method value for define-page
Update jQuery to version 1.10.1
check to make sure redirect-to-login-page always generates html

Signed-off-by: Mario Domenech Goulart <mario.goulart@gmail.com>
Bug fix: page-path should return (app-root-path) when given "/"
Update jQuery to version 1.10.2
Bump version to 0.39.1