Beta release vibe.d 0.7.29-beta.2

[Sönke Ludwig via Digitalmars-d-announce]

The release candidate is planned for the 6th, so please take a moment to 
test this release. Instead of `dub upgrade --prerelease`, edit 
dub.selections.json directly and put 0.7.29-beta.2 as the vibe-d version 
(there is already an alpha version of 0.7.30 out, so the upgrade would 
pick that instead).

Main changes over 0.7.28:

  - Drops support for DMD frontend 2.066.x and below and adds support up
    to 2.071.0
  - Removes all deprecated functionality, as well as the libev driver
  - Contains considerable performance improvement for URLRouter
  - Contains a critical fix for the Json struct, which was prone to
    dangling pointers due to wrong alignment on x64
  - Hopefully removes all instances of "Manually resuming taks that is
    already scheduled" assertion failures

All changes:
https://github.com/rejectedsoftware/vibe.d/blob/master/CHANGELOG.md

DUB package:
http://code.dlang.org/packages/vibe-d/0.7.29-beta.2