Fixed "NameError: global name 'close' is not defined" during setup.

Resolves following error during setup on Ubuntu 14.04.1:

Downloading/unpacking git+https://github.com/Ticketmaster/metrilyx-2.0.git
  Cloning https://github.com/Ticketmaster/metrilyx-2.0.git to /tmp/pip-NGVzyR-build
  Found command 'git' at '/usr/bin/git'
  Running command /usr/bin/git clone -q https://github.com/Ticketmaster/metrilyx-2.0.git /tmp/pip-NGVzyR-build
  Running setup.py (path:/tmp/pip-NGVzyR-build/setup.py) egg_info for package from git+https://github.com/Ticketmaster/metrilyx-2.0.git
    Traceback (most recent call last):
      File "<string>", line 17, in <module>
      File "/tmp/pip-NGVzyR-build/setup.py", line 66, in <module>
        version=get_version(),
      File "/tmp/pip-NGVzyR-build/setup.py", line 20, in get_version
        close(fh)
    NameError: global name 'close' is not defined
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):

  File "<string>", line 17, in <module>

  File "/tmp/pip-NGVzyR-build/setup.py", line 66, in <module>

    version=get_version(),

  File "/tmp/pip-NGVzyR-build/setup.py", line 20, in get_version

    close(fh)

NameError: global name 'close' is not defined