message: Maybe working disable of btn
diff: {{contributor.from}} => {{contributor.to}}
  </md-card-subtitle>
  </md-card-header>
  - <md-card-actions *ngIf="contributor.githubId.length > 0;">
  - <a md-button href="https://github.com/{{contributor.githubId}}" target="_blank">
  + <md-card-actions>
  + <a md-button href="https://github.com/{{contributor.githubId}}" target="_blank"
  + [disbled]="contributor.githubId.length">
  <span class="fa fa-github"></span> Github</a>
  </md-card-actions>
  </md-card>
  