Resolve #30 Embed ES as part of the build


https://github.com/tzolov/elasticsearch-hadoop/tree/master/src/test/java/org/elasticsearch/hadoop/crunch


Sample usage in test:

```Java
    @BeforeClass
    public static void beforeClass() {
      esServer = new EmbeddedElasticsearchServer();
    }

    @AfterClass
    public static void afterClass() {
      esServer.shutdown();
    }
````
There are several helper utility methods for counting, indexing and searching that I found useful for testing (check the CurnchEndToEndTest)