remove support for MSWin32
Remove D2 code
changelog
release preps
v0.3.0

 [BUG FIXES]
 - prevent building for MSWin32 (as it'll fail)

 [ENHANCEMENTS]
 - Remove D2 support.

 [STATISTICS]
 - code churn: 4 files changed, 24 insertions(+), 19 deletions(-)