Update Immutables to Snapshot
Update Immutables to Snapshot

In order to properly handle the contributed changes, Immutables needed to be
updated to a snapshot.  We'll need to keep an eye out for the final release.

[resolves #497]

cloudfoundry/cf-java-client,Orange-OpenSource/cf-java-client,Orange-OpenSource/cf-java-client,cloudfoundry/cf-java-client,alexander071/cf-java-client,alexander071/cf-java-client,orange-cloudfoundry/cf-java-client,cloudfoundry/cf-java-client,orange-cloudfoundry/cf-java-client