Overall it is a bad practice to 'fix' internal modules within the other module.

I think graceful-fs (https://github.com/isaacs/node-graceful-fs#global-patching) is good example, how to do this:

```js
var http = require('http');
var https = requrie('https');

var infinityAgent = require('infinity-agent');
infinityAgent.patch(http);
infinityAgent.patch(https);
```

This will enable global agent tuning in edge cases.

Closes #73 and closes #60

* Base logic moved into event-emitter and all APIs wrapped around it
* read-all-stream combined into one place - less code duplication
* Unzip stream now inherits all properties and function from response and returned instead of response

Closes #66

> EventEmitter was made to be used as an abstraction around asynchronous events. Thus, when an event is emitted it will have happened on a different tick than when the event was set.

See nodejs/node-v0.x-archive#8470 (comment)