Adding Redis and CouchDB to wildfly module.
Adding a datastore element to the configuration.

Only supports jpa at the moment.
Adding DataStoreService for manage different types of DataStores.
Making the persistence-unit a configuration option for jpa.
Adding RedisDataStoreService.
Adding CouchDBDataStoreService.
Adding InMemory datastore to WildFly configuration
Fixing incorrect config parameter 'sockjs-websocket-enabled'
Adding license headers.
Making in-memory datastore the default for wildfly-config.cli.
Updating README.md with regards to datastores.

- MySql is no longer the default.
- Moved the installation instructions to the jpa section.