HSEARCH-1120 Added a hibernate search module for EAP 6.1.0.Alpha1

The EAP 6.1.0 module was added alongside the existing AS 7.1.1 kit (to avoid breaking any clients which use this module currently).

However, because EAP 6.1.0.Alpha1 dist is not available in any Maven repository I was unable to add an integration test for the new kit. Rather, I tested it by deploying it manually in ModeShape's kit and running ModeShape's integration tests.

When https://hibernate.atlassian.net/browse/HSEARCH-1286 is fixed, an additional integration test can be added which validates the module. As a side-note, for ModeShape we went "to great lengths" to be able to run the integration tests using EAP 6.1.0.Alpha1. Currently we have 2 mandatory steps:
- each developer/contributor has to install locally on his/her machine using `mvn install:install-file` the download EAP dist zip
- an additional Maven repository URL was added to our `settings.xml` file to be able to locate the other EAP 6.1.0. components.