Setting env variables to process so version is accessable to rest of msb...

...uild scripts

I generate my NuGet packages from my build script, and teamcity variables are evaluated and the env variables set when it executes each process. 

For the moment i have two steps each executing a target in my msbuild file, but it would be cool to just be able to execute multiple targets

Just an idea (and I havent really tested this, just checking what you think)