build: Add NMake Makefiles for the Tests

This adds a set of NMake Makefiles that is used to build the test programs,
so that one would be able to build the test programs against a Visual C++
build of ATK quickly and easily.  As with the Project files, the listing of
test programs is also done with the Python script, which can also be done
under Windows or called by "make dist" or so quite easily.

https://bugzilla.gnome.org/show_bug.cgi?id=690145
tests/testatk_vc.makin: Update a bit

Change mentions of testglib_vc.mak and testpango_vc.mak in the message when
no CFG= is specified during invokation and have the CFLAGS match the ones
in Makefile.am better.
Release 2.11.4
Updated Greek translation
Updated slovak translation
Merge branch 'master' of git://git.gnome.org/atk