Get Travis CI green again

Our Travis CI is failing because we don't have a `.travis.yml` file set up. For Java projects, Travis will run the command `ant test` by default. Because our `build.xml` did not contain a `test` target, local tests failed. I updated the `build.xml` to include a blank `test`. I also messed with whitespace after seeing a wonky diff with mixed spaces and tabs (stupid default editor settings!).

Testing the application properly will require more work as we have several decisions to make including
* directory structure (`/src/test` and `/src/main` vs `/test` and `/src`)
* build system (`ant`, `maven`, `gradle`, `ivy`)
* what to test