- Move binary packaging scripts out of source root into pkg/ subdir
- A consistent CMake version (2.8.4) is now enforced for binary packaging
- Added a 'bindist' target to top Makefile as a convenience
- The 'dist' target has been rewritten to depend on standard system
command/utils rather than CMake and the full dependency chain of Bro,
addressing #398 (but the CMake 'package_source' target is still available
in the generated build/Makefile and can be used if desired)
