Remove garbage
storage: fix a crash bug by renaming column by "ALTER TABLE CHANGE"

Redmine: fixes #2637
Simplify
Bump version

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

  % make update-latest-release OLD_RELEASE=4.03 OLD_RELEASE_DATE=2014-05-29 NEW_RELEASE_DATE=2014-07-29
doc: add 4.04 entry
doc: update po
apt: add missing depended package
deb: don't execute uninstall script which is already removed

uninstall.sql is already removed on postrm sequence,
so execute such a script on prerm sequence.
source: use the latest Groonga
Ignore auto generated file
ubunutu: remove unsupported version
travis: use latest MySQL 5.5
Merge pull request #13 from cosmo0920/travis-mysql-5.5.39

travis: use latest MySQL 5.5

Patch by cosmo0920. Thanks!!!
travis: use latest MySQL 5.6
Merge pull request #14 from cosmo0920/travis-mysql-5.6.20

travis: use latest MySQL 5.6

Patch by cosmo0920. Thanks!!!
doc: fix wrong MySQL version

Reported by _so4. Thanks!!!