Feature/http image source

[aogilvie]

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();

[jrouault]

:statue_of_liberty: