Use appdirs module to get appropriate cache directory.

This fixes an insecure temporary file creation bug on UNIX-like systems.

remove dtype hash hack since it is fixed in pypy

Fix cl_load_edit_kernel with build options

Added more magics to IPython

Created additional magics for using OpenCL in IPython. They are line magics: cl_load_kernel (loads file as runnable kernel to next cell) and cl_run_kernel (runs kernel from file)

Allow passing build options with IPython Magic

Conflicts:
	test/test_wrapper.py

test_enqueue_task

disable get_host_array for MemoryObject without USE_HOST_PTR since the returned array may not be valid