Fix AttributeError when calling 'setup.py test'

Before fix:

    running egg_info
    creating should_dsl.egg-info
    writing should_dsl.egg-info/PKG-INFO
    writing top-level names to should_dsl.egg-info/top_level.txt
    writing dependency_links to should_dsl.egg-info/dependency_links.txt
    writing manifest file 'should_dsl.egg-info/SOURCES.txt'
    reading manifest file 'should_dsl.egg-info/SOURCES.txt'
    reading manifest template 'MANIFEST.in'
    writing manifest file 'should_dsl.egg-info/SOURCES.txt'
    running build_ext
    Traceback (most recent call last):
      File "setup.py", line 36, in <module>
        test_suite='run_all_examples.test_suite',
      File "/usr/lib/python2.7/distutils/core.py", line 152, in setup
        dist.run_commands()
      File "/usr/lib/python2.7/distutils/dist.py", line 953, in run_commands
        self.run_command(cmd)
      File "/usr/lib/python2.7/distutils/dist.py", line 972, in run_command
        cmd_obj.run()
      File "/home/weslleymberg/.virtualenvs/orchestration/local/lib/python2.7/site-packages/distribute-0.6.24-py2.7.egg/setuptools/command/test.py", line 137, in run
        self.with_project_on_sys_path(self.run_tests)
      File "/home/weslleymberg/.virtualenvs/orchestration/local/lib/python2.7/site-packages/distribute-0.6.24-py2.7.egg/setuptools/command/test.py", line 117, in with_project_on_sys_path
        func()
      File "/home/weslleymberg/.virtualenvs/orchestration/local/lib/python2.7/site-packages/distribute-0.6.24-py2.7.egg/setuptools/command/test.py", line 146, in run_tests
        testLoader = loader_class()
      File "/usr/lib/python2.7/unittest/main.py", line 94, in __init__
        self.parseArgs(argv)
      File "/usr/lib/python2.7/unittest/main.py", line 149, in parseArgs
        self.createTests()
      File "/usr/lib/python2.7/unittest/main.py", line 158, in createTests
        self.module)
      File "/usr/lib/python2.7/unittest/loader.py", line 128, in loadTestsFromNames
        suites = [self.loadTestsFromName(name, module) for name in names]
      File "/usr/lib/python2.7/unittest/loader.py", line 100, in loadTestsFromName
        parent, obj = obj, getattr(obj, part)
    AttributeError: 'module' object has no attribute 'test_suite'
    make: ** [test] Erro 1