Create a variant of core and mapreduce jars that don't conflict with hive 1.x

Currently, the ORC core and mapreduce jars depend on Hive's storage-api 2.2, which is incompatible with Hive 1.x. I'm proposing making shaded versions that:

• shade the storage-api into org.apache.orc.storage
• shade protobuf into com.google.protobuf25

Hive 1.x uses protobuf 2.5, like most of the Hadoop ecosystem, but taking the opportunity to remove it as a problem seems like a good idea.