CD-18 Expose aws box url

@vasili-zolotov @d3ming 

This creates a link to the aws box that's created during ci. Right now it uses the users github icon as the button, but this can be changed later with a real icon. (I didn't want to take a stab at art)
Are these solutions really practical? They seem to over complicate and possibly slow down the existing solution. This is pl specific, and I know the format of the link, so what's wrong with piecing the url together with the provided info?