doc: add note about indexes
doc: update po
Remove garbage line
Bump up version number to 3.0.8

3.0.7 ->
3.0.8

% make update-version NEW_VERSION=3.0.8
deb rpm: add 3.0.8 release entry

% make update-latest-release OLD_RELEASE=3.0.7 OLD_RELEASE_DATE=2013-08-29 NEW_RELEASE_DATE=2013-09-29
Remove accidentally added files
doc: add 3.0.8 release entry
Add magic comment
Use more proper label for "Show Source"
Remove needless variable assignment
Use double width parenthesis in Japanese sentence
Fix miss-leading method name

The method doesn't "fix" because the source link label isn't
broken. The method just adds additional information.
Substitute source link label only if HTML is in Japanese
doc en: update po
mecab: use bulk for keeping wakati-ed string
doc: translate po
Support cascade delete

You can delete referenced records by this change. You got an error for
the operation before this change.

See the committed test about the detail.

Note that an index must be created for this feature. If no index
exists, the record is just deleted and some dangling references are
appeared.
Fix wrong type macro
Support cascade delete for vector column that has not reference type

"not reference type" means normal type such as ShortText.
Update documentation location

[groonga-dev,01800]

Reported by Kazuhiro Isobe. Thanks!!!