add ruby version to gemfile
add assets
Merge branch 'master' of github.com:dev-study/devRulu

* 'master' of github.com:dev-study/devRulu:
  Update README.md
  Update README.md
Merge branch 'master' of github.com:dev-study/devRulu

* 'master' of github.com:dev-study/devRulu:
  lee eui beom
Merge branch 'master' of github.com:dev-study/devRulu

* 'master' of github.com:dev-study/devRulu:
  add autocomplete feature to tag input
  add tags route to posts
new production assets
Merge branch 'master' of github.com:dev-study/devRulu

* 'master' of github.com:dev-study/devRulu:
  Update README.md