GDC Updated to 2.055/1.070

[dsimcha]

Thanks to Iain Buclaw's hard work, GDC is now updated to the latest
2.055/1.070 DMD front end.  Get it while it's hot at
https://bitbucket.org/goshawk/gdc/overview .  Generally, I think this forum
should start having announcements when GDC is updated to the latest DMD front
end.  Also, I can't wait to test drive the 64-bit Windows builds, since some
64-bit Windows patches were merged into Phobos.