packages ubuntu: remove needless file copy

Because rules.ppa is integrated into debian/rules
doc install: update
Add 4.03 entry
deb: remove Ubuntu
Update version

    % make update-version NEW_VERSION_MAJOR=4 NEW_VERSION_MINOR=0 NEW_VERSION_MICRO=3
Update the latest release

    % make update-latest-release OLD_RELEASE=4.02 OLD_RELEASE_DATE=2014-04-29 NEW_RELEASE_DATE=2014-05-29
Use MariaDB 10.0.11
Update the links to Windows binaries

They aren't built yet. :p
Use "unstable" for sid code name for the Groonga's apt repository
Update po
debian: support Debian
Use Groonga 4.0.2
Update MariaDB download URL
Don't build mysql-mroonga package for CentOS
Add workaround for CentOS 5 :<
Ignore auto generated files
Fix a typo
doc ja: update
doc: fix a typo
doc: suppress a warning

    WARNING: document isn't included in any toctree for included file