fix CythonInclude after importlib changes, avoid searching for the built module, avoid changing sys.path

Conflicts:
	Cython/Compiler/ParseTreeTransforms.py

Revert Numpy 1.7 hacks

This reverts commit 95b6e693.

This reverts commit 1eabb1c6.

This reverts commit 6f2271d2.

Conflicts:

	Cython/Compiler/ParseTreeTransforms.py

This reverts commit 29d68530.

move utility code reference of __Pyx_Method_ClassMethod() into Entry to allow its eventual removal at a later stage