code: def pip_installer_url(version=None):
      
      version = version or hpcbench.__version__
      version = str(version)
      if '.dev' in version:
          git_rev = 'master'
          if 'TRAVIS_BRANCH' in os.environ:
              git_rev = version.split('+', 1)[-1]
              if '.' in git_rev:  # get rid of date suffix
                  git_rev = git_rev.split('.', 1)[0]
              git_rev = git_rev[1:]  # get rid of scm letter
          return 'git+{project_url}@{git_rev}#egg=hpcbench'.format(
              project_url='http://github.com/BlueBrain/hpcbench',
              git_rev=git_rev or 'master',
          )
      return 'hpcbench=={}'.format(version)
docs: Get argument to give to ``pip`` to install HPCBench.