COMP: ITK_DISALLOW_COPY_AND_ASSIGN now unconditionally does '= delete'
COMP: ITK_DISALLOW_COPY_AND_ASSIGN now unconditionally does '= delete'

ITK_DISALLOW_COPY_AND_ASSIGN(TypeName) deleted the copy constructor and
assignment by means of ITK_DELETED_FUNCTION, whose definition was platform
dependent. With this commit, it does unconditionally do '= delete', without
using ITK_DELETED_FUNCTION. Any C++11 compiler should support '= delete'.

This commit also changed the return type of the deleted assignment operator
from void to TypeName&, which is according to common practice, also in the
C++ std library.

Change-Id: Ia58b98031b3fa57e6b47308f5910da7c2fee58b9

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