Undoing bf4787bc:

- Should use RemoteScop by default for efficiency (matching the
  javadocs, not the erroneous inline comment
- The 'defaultVersion' field should be private. Depending on what you
  want, the current version can be accessed from
  ScopFactory.getScop().getScopVersion(), or the most recent version is
  ScopFactory.LATEST_VERSION.

Also added some simple tests for ScopFactory. These shouldn't require
any downloads not already needed by subclasses of ScopDatabaseTest.
Adding junit version 4.11 to pom.xml