Remove case handling of 1 for true
Remove case handling of 1 for true

@seancribbs mentioned that protobuffs will now only ever return
`true`, `false`, or `undefined`.

groovenauts-erlang/riak-erlang-client,pma/riak-erlang-client,SiftLogic/riak-erlang-client,GabrielNicolasAvellaneda/riak-erlang-client,jmayfield74/riak-erlang-client,paulperegud/riak-erlang-client,linearregression/riak-erlang-client,rhumbertgz/riak-erlang-client,inaka/riak-erlang-client,esl/riak-erlang-client