Repair style issues in master.

[kwlzn]

before:

[omerta pex2 (master)]$ tox -e style
GLOB sdist-make: /Users/kwilson/dev/pex2/setup.py
style create: /Users/kwilson/dev/pex2/.tox/style
style installdeps: twitter.checkstyle
style inst: /Users/kwilson/dev/pex2/.tox/dist/pex-1.3.2.zip
style installed: gitdb==0.6.4,GitPython==0.3.2rc1,pep8==1.4.5,pex==1.3.2,pyflakes==0.7.2,smmap==0.9.0,twitter.checkstyle==0.1.0,twitter.common.app==0.3.0,twitter.common.collections==0.3.0,twitter.common.contextutil==0.3.0,twitter.common.dirutil==0.3.0,twitter.common.lang==0.3.0,twitter.common.log==0.3.0,twitter.common.options==0.3.0,twitter.common.process==0.3.0,twitter.common.string==0.3.0,twitter.common.util==0.3.0
style runtests: PYTHONHASHSEED='3976592587'
style runtests: commands[0] | twitterstyle -n ImportOrder /Users/kwilson/dev/pex2/pex /Users/kwilson/dev/pex2/tests
T302:ERROR   /Users/kwilson/dev/pex2/tests/test_integration.py:659 Expected 2 blank lines, found 1
     |def test_inherit_path_fallback():

T302:ERROR   /Users/kwilson/dev/pex2/tests/test_integration.py:662 Expected 2 blank lines, found 1
     |def test_inherit_path_backwards_compatibility():

T302:ERROR   /Users/kwilson/dev/pex2/tests/test_integration.py:665 Expected 2 blank lines, found 1
     |def test_inherit_path_prefer():

T302:ERROR   /Users/kwilson/dev/pex2/tests/test_integration.py:668 Expected 2 blank lines, found 1
     |def inherit_path(inherit_path):

F401:ERROR   /Users/kwilson/dev/pex2/tests/test_resolver.py:005 'sys' imported but unused
     |import sys

F401:ERROR   /Users/kwilson/dev/pex2/tests/test_resolver.py:015 'PythonInterpreter' imported but unused
     |from pex.interpreter import PythonInterpreter

ERROR: InvocationError: '/Users/kwilson/dev/pex2/.tox/style/bin/twitterstyle -n ImportOrder /Users/kwilson/dev/pex2/pex /Users/kwilson/dev/pex2/tests'
_______________________________________________________ summary ________________________________________________________
ERROR:   style: commands failed

after:

[omerta pex2 (kwlzn/style_fixes)]$ tox -e style
GLOB sdist-make: /Users/kwilson/dev/pex2/setup.py
style inst-nodeps: /Users/kwilson/dev/pex2/.tox/dist/pex-1.3.2.zip
style installed: gitdb==0.6.4,GitPython==0.3.2rc1,pep8==1.4.5,pex==1.3.2,pyflakes==0.7.2,smmap==0.9.0,twitter.checkstyle==0.1.0,twitter.common.app==0.3.0,twitter.common.collections==0.3.0,twitter.common.contextutil==0.3.0,twitter.common.dirutil==0.3.0,twitter.common.lang==0.3.0,twitter.common.log==0.3.0,twitter.common.options==0.3.0,twitter.common.process==0.3.0,twitter.common.string==0.3.0,twitter.common.util==0.3.0
style runtests: PYTHONHASHSEED='3671025614'
style runtests: commands[0] | twitterstyle -n ImportOrder /Users/kwilson/dev/pex2/pex /Users/kwilson/dev/pex2/tests
_______________________________________________________ summary ________________________________________________________
  style: commands succeeded
  congratulations :)

[kwlzn]

will TBR this once the style shard goes green in my fork.