Added setup.cfg containing additional packaging metadata
Use a MANIFEST.in file so that bdist_rpm includes the license
Added a license argument to setup.py

This is mostly for use by bdist_rpm
Changed setup.py to replace long_description and fix syntax
Use a custom specfile and Makefile for building an RPM
Edited protobuf code to be compatible with protobuf 2.3.0

CentOS 6 distributes protobuf 2.3.0, and this should be compatible with
both the most recent version and the older version CentOS packages.
Updated documentation in preparation for release
Cleanup specfile using rpmlint
Edited QueuedClient for compatibility with protobuf 2.3.0 (see also 14b6eaa)
Cleaned up Makefile
Bumped version for release
Merge branch 'feature/rpm'