Don't use tuples in setup.py requirement specs

[skip ci] See #186 for the motivation of this fix.

Author: Byron

setup.py

@@ -63,7 +63,7 @@ def _stamp_version(filename):
 else:
 print>>sys.stderr, "WARNING: Couldn't find version line in file %s"%filename
 
-install_requires=('gitdb >= 0.6.0',)
+install_requires=['gitdb >= 0.6.0',]
 setup(name="GitPython",
 cmdclass={'build_py': build_py, 'sdist': sdist},
 version=VERSION,
@@ -76,9 +76,9 @@ def _stamp_version(filename):
 package_data={'git.test' : ['fixtures/*']},
 package_dir={'git':'git'},
 license="BSD License",
-requires=('gitdb (>=0.6.0)', ),
+requires=['gitdb (>=0.6.0)'],
 install_requires=install_requires,
-test_requirements=('mock', 'nose')+install_requires,
+test_requirements=['mock', 'nose']+install_requires,
 zip_safe=False,
 long_description="""\
 GitPython is a python library used to interact with Git repositories""",