typo
minor bugfix in RandomSwitchBuilder: warns about 100% percentage sum and else branch iff sum is actually 100%
Merge pull request #2163 from HNeitzel/fix/randomswitch-percentage-check

Core: minor bugfix in RandomSwitchBuilder
adds the possibility to set a signatureCalculator as Expression[SignatureCalculator]

This allows you to e.g. use a user-specific key to sign a request. While it has to change a few internals, it leaves the API unchanged except for adding:
  signatureCalculator(Expression[SignatureCalculator]])
as a way to specify the signature calculator