Remove uses of class_eval
DRY class methods
interpolation -> `#to_s`
Protobuf::Deprecation is now much thinner

We use the much better functionality from AS::Deprecation
Style
Silence deprecation warnings in tests
Add pry debugger gems
Suppress more noisy test output
Merge pull request #232 from tamird/class_eval

Replace Protobuf::Deprecator with a thin wrapper on AS::Deprecation