[#62] Update autoreload to use sessions.

In order to test session support, I had to update supertest
to fix a bug with the superagent module. This caused all of
our tests to fail because "this.app.close();" was used to
shutdown the server after each test - apparently the updates
also addressed this issue.
[#62] Add spec for multiple devices.
[#62] Update /autoreload response to use content object.