Address (most) warnings in functional tests.

One remains:

    % find reporter/functional-tests -name '*.class' | grep target | xargs rm && sbt ';test-functional;last-grep warn'
    [success] Total time: 34 s, completed Sep 2, 2013 11:13:59 AM
    [warn] /Users/jason/code/migration-manager/reporter/functional-tests/src/test/class-bridge-method-ok/v2/A.scala:7: class bridge in package annotation is deprecated: Reconsider whether using this annotation will accomplish anything
    [warn]   @bridge def foo: Int = (foo: Object).asInstanceOf[Int]
    [warn]               ^
    [warn] one warning found

Incidentally, running `sbt 'clean;test-functional'` *doesn't* seem to
clean the products of compiling the functional tests.