How to compile cython module and C version?

1. cython must be installed, you need version >= 0.14.2 so that prange is supported
2. compile C version:
 $ gcc -O2 -fPIC -fopenmp -c integrate_c.c -o libintegrate_c.a
2. issue:
 $ ./setup.py build_ext -i
3. integrate_cython.so should appear next to integrate_cython.pyx

How to run?

1. ./run.py  (edit tests list to enable/disable tests)
