[CMake] D2 support ready for testing

[SK]

Hello,

With excellent help from Jens Mueller and Dean Calver, CMake for D2
now passes our small suite of unit tests on both Windows and Linux.
Our tests include mixed C-D applications and libraries.  We tested
with CMake 2.8.2 and DMD 2.048.  We'd appreciate if a few hardy souls
were willing to take a test drive and give feedback.

Check it out here:
http://code.google.com/p/cmaked2.
Please report problems on the cmaked2 tracker rather than here.

Unfortunately, we have not had an opportunity to test on Mac OS's.

Cheers,
-steve