Pyax12

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Changes:

- change the package name (from `pydynamixel` to `pyax12`), as the project now
focus on Dynamixel AX-12 actuators
- miscellaneous updates and bug fixes

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Changes:

- switch to Python 3
- update the docstrings
- update the `README` file
- rename the `COPYING` file
- add an example (`example/move.py`)
- improve the `Connection.send` function
- miscellaneous updates and bug fixes

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Initial version of the four main modules:

- `connection`
- `packet`
- `instruction_packet`
- `status_packet`

Packaging:

- write the `setup.py` file
- write a script to automatically build the Debian package