Disable tests that need a lot of work for sbt server

These or similar tests should be fixed, but ideally we'll
do it in JavaScript so that we also test the JS layer.
In any case it's a lot of work to fix them since we
need to connect the websocket and Play doesn't come with
a built-in websocket test client.
Merge pull request #639 from typesafehub/wip/havocp-fix-tests

Disable tests that need a lot of work for sbt server