Thrift: Distinguish between string and binary types in C++ and Java.

Thrift: Distinguish between string and binary types in C++ and Java.

Summary:
The upcoming TJSONProtocol handles string and binary types quite differently.
This change makes that distinction in all parts of the C++ binding.

Java already distinguished between string and binary, but this change
also updates the Java skip method to skip over strings as binary
so we don't get encoding errors when skipping binary data.

Reviewed By: mcslee

Test Plan: make check

Revert Plan: ok

Other Notes:
I just pulled this out of Chad Walters' JSON patch.
The only other change was adding readBinary (or was it writeBinary)
to TDenseProtocol.  Maybe inheriting from TBinaryProtocol wasn't a good idea.

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665481 13f79535-47bb-0310-9956-ffa450edef68