[artifactory-release] Release version 2.4.0.M1

Spring Web Flow 2.3.1 release

Fix publishing to use static.springsource.org

Spring Web Flow 2.2.1 release

Spring Web Flow 2.2.0.RELEASE tag (correction)

Spring Web Flow 2.2.0.RC1 tag

spring-webflow-2.2.0.M1

Correct version issues with 2.1.1 tag

Spring Web Flow 2.1.0.RELEASE tag

Spring Web Flow 2.1.0.RC1 release tag