Added 'vendors/msgpack' submodule
Added PyPromise submodule to 'vendors/pypromise'
Added Travis-CI configuration file (.travis.yml)
Removed unused vendors/.gitkeep file
Added __init__.py files to pygrapes and pygrapes/serialization directories
Refactored _path.py files in order to remove dependency on argparse
Removed incorrect Licence information; Removed author and date information from adapters