Added missing Vector2 and Vector3 template to Cython headers
Updated setup.py to install headers in new locations (Unix)

Cython headers: /usr/local/lib/python2.7/dist-packages/Cython/Includes/libcpp/sfml.pxd
C API: /usr/include/pysfml/*.h
Cython API: /usr/lib/pythonX.Y/pysfml/*.pxd