vibe.d 0.7.33 maintenance release

[Sönke Ludwig]

Being the final public release on the 0.7.x branch, this version on DMD 
2.068.2 up to DMD 2.080.0 and LDC 1.9.0. It includes some major fixes 
and improvements backported from the 0.8.x branch. Since this marks the 
last 0.7.x release, all code depending on it should now be upgraded to 
0.8.3 or later.

Change log:
<http://vibed.org/blog/posts/vibe-release-0.7.33>

DUB package:
<https://code.dlang.org/packages/vibe-d/0.7.32>