[BUGFIX] Github -> Repos -> Statuses -> Show gives 404

If you request a github repo status via api
$githubClient->api('repository')->statuses()->show(...
the HTTP client throws a 404, because the request URL build "//repos/...".
Merge pull request #35 from andygrunwald/status-show-request-404

[BUGFIX] Github -> Repos -> Statuses -> Show gives 404