Add support for repositories using ssh in github-deploy

[ghost]

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• I'm submitting a ...
  [ ] bug report
  [X ] feature request
  [ ] question about the decisions made in the repository
• Do you want to request a feature or report a bug?
  Request a feature. Add support to extract repository name when using ssh in connection with github-deploy feature.
• What is the current behavior?
  getRepoName(remoteName) only extracts the repository name if the remote is https. Otherwise, it throws an error.
• If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem via
  https://plnkr.co or similar (you can use this template as a starting point: http://plnkr.co/edit/tpl:AvJOMERrnz94ekVua0u5).
• What is the expected behavior?
• What is the motivation / use case for changing the behavior?
  Catch both https and ssh use cases for gh-pages.
• Please tell us about your environment:
• Angular version: 2.0.0-r.c.4
• Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]
• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, gitter, etc)

I simply added a nested if function to catch my ssh case:

const HTTPS_REPO_NAME_RE = /Push  URL: https:\/\/github\.com\/.*\/(.*)\.git/;
const SSH_REPO_NAME_RE = /Push\s*URL:\s*git@github\.com:.*\/(.*)\.git/;

function getRepoName(remoteName) {
  remoteName = remoteName || 'origin';

  var stdout_https = execSync('git remote show ' + remoteName),
      match_https = HTTPS_REPO_NAME_RE.exec(stdout_https);

  var stdout_ssh = execSync('git remote show ' + remoteName),
      match_ssh = SSH_REPO_NAME_RE.exec(stdout_ssh);

  if (!match_https) {
     if (!match_ssh) {
        throw new Error('Could not find a repository on remote ' + remoteName);
     } else {
       return match_ssh[1];
    }} else {
      return match_https[1];
  }

}

[shlomiassaf]

@thatn3wguy If you post a PR I will merge it.

If not I'll get to it sometime soon.

If you do, try having 1 regex instead of 2