zetta.use() looks at constructor.name to check if Scout/Device/HttpDdevice

@kevinswiber @mdobson  Fix for zetta.use() fixes #51

Well have to merge in and update the dependency versions for these three modules:

https://github.com/zettajs/zetta-scout/pull/1
https://github.com/zettajs/zetta-device/pull/1
https://github.com/zettajs/zetta-http-device/pull/1