Moved MessageChain to the __init__.py file.
Moved Request into the __init__.py file.
Moved Response and the built-in handlers into the __init__.py file.
Re-arranged code.
Moved Handling into the __init__.py file.
Moved HeaderCollection into the __init__.py file.
Removed the un-used text_from_file and lines_from_file functions.
Moved the read_body_from_stream function into the __init__.py file.
Renamed __init__.py to deproxy.py and moved it out of the deproxy/ folder. The project is now a single module, instead of a package.