Implement complex number support in arrays.

contrib/fortran-to-opencl/translate.py

doc/source/array.rst

doc/source/misc.rst

pyopencl/__init__.py

pyopencl/array.py

pyopencl/clmath.py

pyopencl/compyte

pyopencl/elementwise.py

pyopencl/tools.py

setup.py

src/cl/pyopencl-complex.h

src/wrapper/numpy_init.hpp

test/test_array.py

test/test_clmath.py