Support normalizeHttpPath

This options should probably become the default at some point (opt-out
instead of opt-in).

Thoughts on setting this globally (config.json) are welcome.

Mandatory PR: https://github.com/strongloop/strong-remoting/pull/90
>  nice to have feature: allow developers to turn on/off the flag normalizeHttpPath via server/config.json.

good idea :+1: