Put the "edit this page on GitHub" button on each usermanual page

[jakub-g]

On Karma, and many other projects, there's a direct link to edit the documentation page you're looking at right now, directly on Github (top right):

http://karma-runner.github.io/0.10/config/browsers.html

This would be a great opportunity to minimize the effort for people to contribute to the documentation.

However it's not that simple do this kind of thing on our side now, because the URLs in usermanual and github repo do not match: the URLs are flat on AT.com

//ariatemplates.com/usermanual/latest/ working_in_an_asynchronous_world

while they're structured in the repo:

//github.com/ariatemplates/usermanual/blob/master/src/latest/ core/concepts/working_in_an_asynchronous_world .md

(honestly I don't like this discrepancy, I don't have a preference, but it should be consistent)

However if we don't want to change the structure, in order to implement the feature, we could embed the "github classpath" in each MD file (via JS variable maybe and then make a script which will read it and put a DOM element with a link, or make it build-time, whatever is easier to do).

[jakub-g]

Regarding contributing documentation from external people:
we have a link on the bottom of AT.com (CONTRIBUTE > Documentation) which leads to:
http://ariatemplates.com/contribute/documentation :)

[jakub-g]

I added the link "open an issue on github" in efdbbb5 in the bottom of documentation entries, but I still think "edit this on github" would be even better :)