Migrate to Spring 4.1.0.GA !

Be careful about the @ResponseView -> @JsonView breaking change.
Had to change some XML test assertion due to an extra leading line break, if you find why it changed please notice me.
There may be some remaining configuration and documentation updates.
messageConverters declaration existed before I removed mvc-annotation-driven usage but I think that these converters are not necessary anymore because of specific resthub converters removal.

But I am afraid that mvc:annotation-driven will not allow us to finely configure dots in url as described in #217 and despite https://jira.spring.io/browse/SPR-10163.