Add network proxy option

[v-shan]

We deploy behind a proxy so we needed the proxy option to be available. Just grabbed from here: http://docs.aws.amazon.com/AWSJavaScriptSDK/guide/node-configuring.html#Configuring_a_Proxy

[v-shan]

ping @lukemelia @ghedamat

[ghedamat]

hi @v-shan

sorry for the delay

A small suggestion:

you could use something like
https://github.com/v-shan/ember-cli-deploy-s3/blob/8f62ac24b0f994dbfcc01664f936979777616d9a/lib/s3.js#L44

to pass in the proxyAgent as an option, and use a default

this would also allow you to add a test for your code that mocks it and ensures that proxyAgent(proxy) is called
https://github.com/v-shan/ember-cli-deploy-s3/blob/8f62ac24b0f994dbfcc01664f936979777616d9a/lib/s3.js#L39

similar to what we do here
https://github.com/v-shan/ember-cli-deploy-s3/blob/8f62ac24b0f994dbfcc01664f936979777616d9a/tests/unit/index-nodetest.js#L259-L272

let me know what you think!

[v-shan]

Thanks! Will do.

[v-shan]

@ghedamat updated! Let me know if I may have misunderstood your suggestion.

Thanks!

[ghedamat]

LGTM! thanks a lot!