Smarter handling of missing git user.name

[wollmers]

It doesn't install if user.name is not configured. IMHO it would be better to skip the tests

t/project/badge.t
t/project/static_install.t

and warn the user at the time of the first usage on a project, if and only if the user name is essential (I doubt). The installation also takes a very long time in the case of FAIL.

It should also mentioned in the tutorial as first sentence in the chapter Installing and not after

> cpanm Minilla

For best usabilty provide the command

git config --global user.name "Your Name"

[skaji]

patches are welcome