Support Twitter API v1.1 in spring-integration-twitter

Updated spring-integration-twitter's dependency on Spring Social Twitter to 1.0.4.BUILD-SNAPSHOT (and transitively to Spring Social Core to 1.0.3.BUILD-SNAPSHOT) to be able to use Twitter API 1.1.

Twitter API v1.0 will be retired on June 11, 2013, making this change necessary.

Note that although these dependencies are currently set to snapshot builds, I intend to push Spring Social Twitter 1.0.4.RELEASE and Spring Social Core 1.0.3.RELEASE builds on June 6, 2013. At that time, these dependencies can be updated accordingly.