Add proxy option

[andolini]

Fixes #280.

[gauntface]

Could you separate the check for the type of options.proxy and print a console warning if it's set but not used because it's not a string.

I'd also be happy with throwing an error.

[gauntface]

Could you also add a test (along the lines of

web-push/test/test-generate-request-details.js

Line 228 in 61dddeb

test('Extra headers', function() {

)

[marco-c]

A separate test should be added for the proxy option, this test is for the Extra headers parameter.

[marco-c]

It would be nice to have a test in test/testSendNotification.js too, but we can do it in a follow-up.

[marco-c]

The Travis build with the stable version of Node is failing with:

Error: Cannot find module 'ms'
    at Function.Module._resolveFilename (module.js:543:15)
    at Function.Module._load (module.js:470:25)
    at Module.require (module.js:593:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (/home/travis/build/web-push-libs/web-push/node_modules/debug/src/debug.js:14:20)
    at Module._compile (module.js:649:30)
    at Object.Module._extensions..js (module.js:660:10)
    at Module.load (module.js:561:32)
    at tryModuleLoad (module.js:501:12)
    at Function.Module._load (module.js:493:3)

[marco-c]

This file has a lot of changes that might be unnecessary.

[marco-c]

Merged manually in f099ec8. Thanks!

[propr]

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