Made cython a dependency and removed c files from the distribution.

Author: CnlPepper

MANIFEST.in

@@ -1,5 +1,5 @@
 include README.md CHANGELOG.txt LICENSE.txt CONTRIBUTING.txt AUTHORS.txt MANIFEST.in setup.py .gitignore
 include raysect/VERSION
-recursive-include raysect *.py *.pyx *.pxd *.csv *.json *.c
+recursive-include raysect *.py *.pyx *.pxd *.csv *.json
 recursive-include demos *.py *.pyx *.pxd *.csv *.obj *.rsm
 recursive-include docs *

setup.py

@@ -87,11 +87,9 @@
         "Topic :: Multimedia :: Graphics :: 3D Rendering",
         "Topic :: Scientific/Engineering :: Physics"
     ],
-    install_requires=[
-        'numpy',
-    ],
+    install_requires=['numpy', 'cython>=0.28'],
     packages=find_packages(),
     include_package_data=True,
     zip_safe= False,
-    ext_modules=extensions)
-
+    ext_modules=extensions
+)