Manage corporate proxies

[Ninir]

Hey JAWS team,

As for the JAWS framework, I am in a need of managing AWS Lambdas & API endpoints using JAWS.
At the moment, deploying lambdas solely works fine (as soon as serverless/serverless#223 will be merged).
However, deploying API endpoints is a problem, as the request isn't made with AWS, and it isn't managing proxies at all if I look at the code.

If you guys have a quick idea it would be fine! I'll dig into this and come with a PR as soon as it is fine enough.