Reduce the exposed type granularity down, maintains binary compat wit…

[ianoc]

…h last rls

Remaining binary incompatible changes between releases looks like:

[error]  * method fromBuilder(scala.collection.mutable.Builder,com.twitter.bijection.json.JsonNodeInjection)com.twitter.bijection.json.JsonNodeInjection in object com.twitter.bijection.json.JsonNodeInjection does not have a correspondent in new version
[error]    filter with: ProblemFilters.exclude[MissingMethodProblem]("com.twitter.bijection.json.JsonNodeInjection.fromBuilder")
[error]  * the type hierarchy of class com.twitter.bijection.scrooge.BinaryScalaCodec has changed in new version. Missing types {com.twitter.bijection.scrooge.ScalaCodec}
[error]    filter with: ProblemFilters.exclude[MissingTypesProblem]("com.twitter.bijection.scrooge.BinaryScalaCodec")
[info] bijection-core: found 0 potential binary incompatibilities
[info] bijection-hbase: found 5 potential binary incompatibilities
[error]  * object com.twitter.bijection.hbase.HBaseBijections#ImmutableBytesWritableBijection does not have a correspondent in new version
[error]    filter with: ProblemFilters.exclude[MissingClassProblem]("com.twitter.bijection.hbase.HBaseBijections$ImmutableBytesWritableBijection$")
[error]  * method bigdecimal2BytesInj()com.twitter.bijection.Injection in object com.twitter.bijection.hbase.HBaseInjections does not have a correspondent in new version
[error]    filter with: ProblemFilters.exclude[MissingMethodProblem]("com.twitter.bijection.hbase.HBaseInjections.bigdecimal2BytesInj")
[error]  * object com.twitter.bijection.hbase.HBaseBijections does not have a correspondent in new version
[error]    filter with: ProblemFilters.exclude[MissingClassProblem]("com.twitter.bijection.hbase.HBaseBijections$")
[error]  * class com.twitter.bijection.hbase.HBaseBijections#ImmutableBytesWritableBijection does not have a correspondent in new version
[error]    filter with: ProblemFilters.exclude[MissingClassProblem]("com.twitter.bijection.hbase.HBaseBijections$ImmutableBytesWritableBijection")
[error]  * class com.twitter.bijection.hbase.HBaseBijections does not have a correspondent in new version
[error]    filter with: ProblemFilters.exclude[MissingClassProblem]("com.twitter.bijection.hbase.HBaseBijections")