CXX-319 Update Windows Buildvariants

I changed the display names for our windows builds. They're slightly more arcane, but are now short enough to fit in the space allowed in the Waterfall view.

Also, this adds new windows buildvariants that test the following permutations of dynamic-ness:

1 - static mongo client / static windows runtime
2 - static mongo client / dynamic windows runtime
3 - dynamic mongo client / dynamic windows runtime

I didn't test all of these on both msvc2010 and 2013, that would be a lot of buildvarients.  Rather case 1 is tested on 2010, 2 is tested on 2013, and 3 is tested on both.

If you think we need more buildvariants, or if it seems like we should drop one of the variants testing case 3, let me know.