Thrift-1859: Generated error c++ code with -out and include_prefix param
Client: cpp
Patch: Jingxu Chen

Updates output directory to no longer include gen-cpp folder when using -out.
THRIFT-986: smalltalk add version Info to the library
Client: smalltalk
Patch: Jake Farrell

Adding package.xml file for smalltalk library and added a version comment
in the xml header as smalltalk packages do not contain a version reference.