Fix static import which throws off Scala builds

For some reason sbt with android-plugin is not able to deal with these static imports.

The error itself is:

    ... SherlockFragment.java:11: value OnCreateOptionsMenuListener is not a member of object com.actionbarsherlock.app.SherlockFragmentActivity
    [error] import static com.actionbarsherlock.app.SherlockFragmentActivity.OnCreateOptionsMenuListener;

Importing them from Watson.java fixes the problem.