adding first solr integration as part of issue #9

This PR requires a local installation of Solr using the schema provided in the `src/test/resources/index/schema.xml` file. The connection details are kept in `src/main/resources/mamute.properties` file. First step towards #9 
Bit of a habit of mine, I like to leave them package private so my unit tests can get at individual methods. If it's contrary to your code guidelines, I'll make it private though.