Variable name "url" in my script conflicts with url.min.js

Web Console (Firefox): "TypeError: url is not a function"
(I'm using "url2" in my script now to get it to work.)

[bettiolo]

Currently we are using js-url to parse urls in the browser, we would need to avoid using globals:
https://github.com/bettiolo/oauth-signature-js/blob/master/src/app/oauth-signature.js#L92-L97
In the highlighted code url is global.

We could inline url parsing logic to solve this issue.