THRIFT-275. rb: Remove deprecated classes from Ruby library

THRIFT-275. rb: Remove deprecated classes from Ruby library

This patch removes all the deprecation stuff and the t*.rb classes that were only placeholders. In addition, I've changed the implementations of some "abstract" methods to throw NotImplementedError instead of returning nil, and fixed the test accordingly. Finally, I removed the no longer required borrow and consume methods from all the transport implementations that had them. (Borrow and consume have been supplanted by the thrift_native package.)

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@757668 13f79535-47bb-0310-9956-ffa450edef68