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 
Eclipse said no tests uses this methods, thats why I asked :D. We try not to modify our production code for test purposes, if a private method should be tested it probably should be in another class