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 
`setup()` is a `@BeforeClass` method, it loads the initial question set into Solr. This may be overkill, but the test loads the first 3 chapters of War and Peace as question titles for test data. This takes some time, so I only do it once for the class.

Originally, I was experimenting with how fast Solr could be and finding a particular search string; I loaded the entirety of War and Peace and was still able to do a full text search in under a few hundred milliseconds. I kept in the first three chapters because they served as useful "noise" when trying to test boosting a particular question to the top.

I can take that part out if you'd like, it's the only reason to keep these fields static.