Update Travis
Update pacakge.json
Update package
[WIP] catch remote resource in CSS
Change version node
[WIP] fetch remote image and base64 it

Actually for a remote image, the request callback failed to write on
file.
Base64 returned when gulp process is finished.

[WIP]

WIP
Fetch remote resource, add test
Add test for remote resource
Cleans
JsHint, JsBeautifer, use strict
Update README.md