ko: Copying from ja to ko

- Japanese files will be the base of Korean localization work.
ko: Google translation for *.rst & Makefile/conf.py from ja

conf.py  - ja -> ko (with removing some japanese style file settings)
*.rst    - http://translate.google.com
ko: typos & minor additional translation

1. Edit typos (e.g., references) from google translator
2. Minor additional translation (e.g., 'data' in rest_firewall)
ko: conf.py - language setting to Korean
Edited README.md to explain Korean edition
ko: changed figures (ja->en)

 (English figures are more familiar with me...)
ko: added missed fig1.png
Changed README.md (added some comments)
ko: LF
en & ko: switching_hub (dle->idle) for en and..

Korean - liberal translation for mainly preface and switching_hub
       (a little on arch and packet_lib)
ko: liberal translation on traffic_monitor section