remove sphinx from setup.py

setup.py

@@ -1,7 +1,4 @@
 from setuptools import setup
-from sphinx.setup_command import BuildDoc
-
-cmdclass = {'build_sphinx': BuildDoc}
 
 name = 'PyTestPavement'
 version = '0.01'
@@ -11,18 +8,12 @@ setup(
     author='Markus Clauß',
     author_email='markus.clauss@tu-dresden.de',
     version=release,
-    cmdclass=cmdclass,
-    # these are optional and override conf.py settings
-    command_options={
-        'build_sphinx': {
-            'project': ('setup.py', name),
-            'version': ('setup.py', version),
-            'release': ('setup.py', release),
-            'source_dir': ('setup.py', 'doc')
-        }
-    },
     install_requires=[
-        'lmfit', 'pandas', 'numpy', 'scipy', 'mongoengine', 'sphinx'
+        'lmfit',
+        'pandas',
+        'numpy',
+        'scipy',
+        'mongoengine',
     ],
     packages=['pytestpavement'],
 )