code: public void createBranch(GitlabProject project, String branchName, String ref) throws IOException {
          createBranch(project.getId(), branchName, ref);
      }
docs: Create Branch.
  <a href="http://doc.gitlab.com/ce/api/branches.html#create-repository-branch">
  Create Repository Branch Documentation
  </a>
  
  @param project    The gitlab project
  @param branchName The name of the branch to create
  @param ref        The branch name or commit SHA to create branch from
  @throws IOException on gitlab api call error