Feature/http image source

## About
This adds ability for localhost XHR requests.

## Testing Code

- Add a file named text.txt to the `assets/www/` dir
- Add the code below to the bottom of index.js

```
// test XMLHttpRequest
var request = new XMLHttpRequest();
request.onreadystatechange = function (aEvt) {
	console.log("Readystate: " + request.readyState);
	if (request.readyState == 4) {
		if (request.status == 200) {
			console.log("+++++++++++++++ " + request.responseText);
		} else {
			console.log("Error loading");
		}
	}
};
request.open("GET", "text.txt");
request.send();

```