vibe.d 0.7.14 and DUB 0.9.12 released

[Sönke Ludwig]

Just retested using weighttp instead of ab and now got up to 90 kreq/s
with "weighttp -c 100 -n 100000 -k http://127.0.0.1/empty".

Still way to go compared to what others claim (e.g. vert.x or gwan) but
since adding just some DB queries, file I/O or dynamic memory
allocations already destroy the numbers, this is really just a very
artificial setup for 99% of the applications anyway. Quite important for
marketing, though, I guess.