Add remoting options to server/config.json

/to @bajtos @ritch 

See https://github.com/strongloop/loopback/issues/608
See https://github.com/strongloop/loopback/pull/337
The comments in strongloop/loopback#608 indicate that `normalizeHttpPath` is read from `remoting.normalizeHttpPath`, not `remoting.rest.normalizeHttpPath`.

Please write an automated test to verify we got this right. Something along the lines:

 1. Assert that `remoting.context.normalizeHttpPath` is defined as `false` in the scaffolded app. That way the test fails if we change the default config in the future (e.g. move the key to a different place).
 2. Edit `server/config.json` and set `normalizeHttpPath` to `true`.
 3. Setup anything else needed to verify that http paths are normalized.
 3. Start the server, verify that http paths are normalized now.

Ideally, there should be one test for each of the config options. To be realistic, I think it should be ok to test only `enableHttpContext` and `normalizeHttpPath`.