updated many docstring. mostly minor changes.

user can toggle full-width mode via C-c , .
or they can set zero-full-width-mode in buffer or use setq-default to
set default value for all buffers.

according to http://www.apache.org/legal/src-headers.html#headers, there
should be no copyright notice in the header.

added "make compile" to byte-compile and run tests in emacs batch mode.

- added zero-version variable in zero-framework.el

now user typed phrases will be saved.

- zero-framework.el add support for :shutdown function
- bugfix: zero-backspace-original-func check for nil before setq
- update zero-pinyin-service client, service is renamed

dbus based sync and async api both works.
- added error handler for dbus client in emacs lisp.
- use lexical-binding for all files
- added M-x zero-reload-all this will byte compile and reload file files.