git-remote-mediawiki: test environment of git-remote-mediawiki

git-remote-mediawiki: test environment of git-remote-mediawiki

In order to test git-remote-mediawiki, a set of functions is needed to
manage a MediaWiki: edit a page, remove a page, fetch a page, fetch all
pages on a given wiki.

A few helper function are also provided to check the content of
directories.

In addition, this patch provides Makefiles to execute tests.
See the README file for more details.

Signed-off-by: Simon CATHEBRAS <redacted>
Signed-off-by: Julien KHAYAT <redacted>
Signed-off-by: Simon Perrat <redacted>
Signed-off-by: Charles ROUSSEL <redacted>
Signed-off-by: Guillaume SASDY <redacted>
Signed-off-by: Matthieu Moy <redacted>
Signed-off-by: Junio C Hamano <redacted>