GitCommands::gitRemoteAdd has bad function signature

[mikeholler]

It should be called like this:

$gitCommands->gitRemoteAdd($alias, $url);

But currently its method signature is:

public function gitRemoteAdd($userName, $project, $alias);

[ZAM-]

Gotcha, I was assuming some things here that were obviously incorrect to assume. I'll fix this and request a PR.