Merge pull request #163 from caok/master

modify something
Fixed #164 about report of total grow
fix sort bug
Merge remote-tracking branch 'upsteam/master'
use gem mysql2 all envs #166
Merge pull request #172 from mouse-lin/master

use gem mysql2 all envs
Merge pull request #167 from kaku87/fixbug

fix sort bug
Fixed #148
Create dev_doc.markdown
Update README.md
Merge branch 'master' of github.com:bay6/union