Address dependency issues (updated libs, address VersionConflict)

Fixes test_dns.py from change in python-whois.
Updates pep8 requirement from jcrocholl/pep8 Issue#240:
    Fix was merged into pep8 1.5.7
Updates hacking requirement to fix VersionConflict

When trying to invoke `flake8`
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Traceback (most recent call last):
  File "~/.virtualenvs/satori-dependencies-dev/bin/flake8", line 11, in <module>
    sys.exit(main())
  File "~/.virtualenvs/satori-dependencies-dev/local/lib/python2.7/site-packages/flake8/main.py", line 24, in main
    flake8_style = get_style_guide(parse_argv=True, config_file=DEFAULT_CONFIG)
  File "~/.virtualenvs/satori-dependencies-dev/local/lib/python2.7/site-packages/flake8/engine.py", line 89, in get_style_guide
    kwargs['parser'], options_hooks = get_parser()
  File "~/.virtualenvs/satori-dependencies-dev/local/lib/python2.7/site-packages/flake8/engine.py", line 40, in get_parser
    (extensions, parser_hooks, options_hooks) = _register_extensions()
  File "~/.virtualenvs/satori-dependencies-dev/local/lib/python2.7/site-packages/flake8/engine.py", line 26, in _register_extensions
    checker = entry.load()
  File "~/.virtualenvs/satori-dependencies-dev/local/lib/python2.7/site-packages/pkg_resources.py", line 2028, in load
    if require: self.require(env, installer)
  File "~/.virtualenvs/satori-dependencies-dev/local/lib/python2.7/site-packages/pkg_resources.py", line 2041, in require
    working_set.resolve(self.dist.requires(self.extras),env,installer)))
  File "~/.virtualenvs/satori-dependencies-dev/local/lib/python2.7/site-packages/pkg_resources.py", line 576, in resolve
    raise VersionConflict(dist,req) # XXX put more info here
pkg_resources.VersionConflict: (pep8 1.4.7a0 (~/.virtualenvs/satori-dependencies-dev/src/pep8), Requirement.parse('pep8>=1.5.7'))
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