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 
Is there a reason for static default attributes?
making the test attributes static the tests can interfere on each other, you can use a setUp method to do that initializations before every test using the `@Before` annotation.