Some obvious typos were corrected. Other material improved.
The section on Git was considerably improved.
An entirely new section on Git was added, but which contains some previous
material on git.
The reason for adding a new section on Git was I though it better to have one
single place where someone new to Git and Lumiera could read a simple
recipe-type explanation on how to retrieve source code, make changes and then
push the changes. All information necessary including Git, links, etc should be
on this page, no following liknks. In fact there is no real _new_ information
here that isn't to be found somewhere else. The point being that _all_
information necessary to ge someone up and going is located on one page.
For this reason, I added information on the mailing list and IRC; again, all
essential information in how to contribute to Lumiera, the title ang goal of
this page.
There might be stuff missing here, so please add, but do not make this page too
long. That tends to scare people, in fact, someone might just like to shorten my
contributions here, that would be good!
