Removing the requirement of a version in the notification body.

It will no longer be mandatory to have a version property in the PUT
request body. Instead, if the version property is left out the server
will generate a UTC date for the version which will be delivered to the
registered channel.

[https://issues.jboss.org/browse/AGSMPLPUSH-54]
Making NotificationHandler's thread pool bounded.

- The size is of the thread pool is configurable.

[https://issues.jboss.org/browse/AGSMPLPUSH-55]
Changing the fileformat to unix instead of dos.
[maven-release-plugin] prepare release 0.11.0
[maven-release-plugin] prepare for next development iteration
Adding Docker image to enable running the complete test suite.

Motivation:
Currently running all the tests in the project requires a local
installation of CouchDB and Redis. Providing a Docker image with these
databases pre-installed might help others to also run the complete test
suite.
Adding Travis build status image.
Merge branch 'pr/81'
Fixing path to upstream repository.
Adding a WebSocket test client similar to the SockJS one.