repositories: Temporary fix treasuredata.com repo

treasuredata.com is now cached by apt-miror on os-ci-admin.
Since 2014/12/22 Release{,.gpg} doesn't match to Packages{,.gz}
I've send an email to treasuredata team.

This patch fix the issue, I revert this patch when upstream repo
was fixed.
Merge pull request #121 from enovance/treasuredata

repositories: Temporary fix treasuredata.com repo