CodeIgniter Localizing into Japanese

update libraries/*.html

update helpers/*.html

update helpers/*.html

little translated changelog.html

little translated changelog.html

little translated changelog.html

little translated changelog.html

update toc.html and nav/nav.js

update toc.html

translated caching driver

update helpers/security_helper.html

fixed email helper

fixed email helper

update changelog.html

update userguide.css

update general/*.html

update doc_style/index.html

update database/*.html

update general/models.html

update libraries/form_validation.html

modified footer from 2010 to 2011

update database/active_record.html

little translate libraries/caching.html

update nav/nav.js

little translated libraries/javascript.html

little translated general/creating_drivers.html

added Japanese Translation note and changed Google search URI.

add and remove files for CodeIgniter 2.0.0

(empty log message)

fix typo (r341)