Increment build number with TeamCity number for -beta releases (#2874)
Increment build number with TeamCity number for -beta releases (#2874)

* build number increment for nugetprerelease=dev

* remove commented code

ali-ince/akka.net,amichel/akka.net,heynickc/akka.net,Silv3rcircl3/akka.net,ali-ince/akka.net,simonlaroche/akka.net,amichel/akka.net,Silv3rcircl3/akka.net,heynickc/akka.net,simonlaroche/akka.net