Remove cython from install dep

MANIFEST.in

@@ -0,0 +1,2 @@
+recursive-include pugixml/src *.hpp *.cpp
+include pugixmltodict.pyx

pugixmltodict.pyx

@@ -1,5 +1,4 @@
 # distutils: language = c++
-# distutils: sources = pugixml/src/pugixml.cpp
 
 from libc.string cimport const_char
 from libc.stddef cimport ptrdiff_t

setup.py

@@ -1,9 +1,31 @@
-from distutils.core import setup
-from Cython.Build import cythonize
+# coding: utf-8
+import sys
+from distutils.core import setup, Extension
+
+
+USE_CYTHON = False
+CYTHON_PARAM = '--cython'
+if CYTHON_PARAM in sys.argv:
+    USE_CYTHON = True
+    sys.argv.remove(CYTHON_PARAM)
+
+
+SOURCE_EXT = '.pyx' if USE_CYTHON else '.cpp'
+EXT_MODULES = [Extension(
+    'pugixmltodict',
+    sources=[
+        'pugixmltodict' + SOURCE_EXT,
+        'pugixml/src/pugixml.cpp',
+    ],
+)]
+
+if USE_CYTHON:
+    from Cython.Build import cythonize
+    EXT_MODULES = cythonize(EXT_MODULES)
 
 
 setup(
-    name = 'pugixmltodict',
+    name='pugixmltodict',
     version='0.1',
     description='A fast alternative to xmltodict library',
     url='https://github.com/sepeth/pugixmltodict',
@@ -14,9 +36,10 @@
         'Development Status :: 3 - Alpha',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: MIT License',
+        'Programming Language :: Cython',
         'Programming Language :: Python :: 2.7',
         'Topic :: Text Processing :: Markup :: XML',
     ],
 
-    ext_modules = cythonize('*.pyx'),
+    ext_modules=EXT_MODULES,
 )