Visual D 0.3.20 released

[Sönke Ludwig]

This is really cool, it's now really fun to develop from inside 
VisualStudio - basically everything just works! (Mago only seems to work 
sporadically but the VS debugger with a breakpoint at __d_assertm works 
fine).

There is only one small thing in VisualD itself; There is a .ddoc file 
added to the compiler command line manually as additional options in my 
projects. This file is deleted when a clean is invoked although it is no 
intermediate/output file. I think it is because it lies in the same 
directory in which the documentation is generated and the whole 
directory is cleared.

Thank you for sharing your excellent work!