Allowing proxy as a config option

Proxy was not part of config setting for SL driver. Allowing it so that
users behind proxy can use it.
Merge pull request #65 from amol/proxy

Allowing proxy as a config option
Merge branch 'user-get-request' of https://github.com/anil-kumbhar/jumpgate into user-get-request
Always raised 404, even if user is unauthorized

User can retrieve details of all users that he has access to otherwise 404 HTTP error will be returned.