2014.07.31, Version 0.8.28 (maintenance)

* v8: Interrupts must not mask stack overflow. (Fedor Indutny)
build: run wix tool chain out of process

Building MSIs for different arch's can sometimes confuse MSBuild and
Wix, isntead run the toolchain externally so we don't have to worry
about which arch cmd.exe is running as.
Merge branch 'v0.8.28-release' into v0.8
Now working on 0.8.29