Update help link

Update help link to point to github the new place of this thingy
added use http or https

added use http or https in proxy script and admin controler
added language param to iframe url

making the iframe of piwik dashboard in the language of the employee not
the browser
added template inputs

added template inputs to define how product id is passed on to piwik
added more currency conversion thing

added more currency conversion, but the final conversion between the
currencies are off by a few cents
added setUserId