Added new testing architecture

The main goal of the new architecture is to avoid code duplication
between JSP and Thymeleaf implementations
* All tests now extends BaseIT
* Some tests are now factorized in *BaseIT
* Jetty is now started and stopped using custom Runner :
JspContextRunner and ThymeleafContextRunner
* Access to page is abstracted in the BaseIT class and use the new
@JspTest and @ThymeleafTest annotations to build the path to the page
* Some tests are temporarily ignored