Use coffeelint

coffeelintを通して意識を高めよう :triumph:

- [x] `npm run lint`でcoffeelint
- [x] 一行80文字制限は`error`から`warn`に:persevere:
- [x] travis-ciでcofeelint実行する

```
$ npm run lint

> hosted-hubot@2.7.1 lint /Users/sane/work/omg/omg-hubot
> coffeelint -f coffeelint.json *.json scripts/*.coffee

  ✓ coffeelint.json
  ✓ external-scripts.json
  ✓ hubot-scripts.json
  ✓ package.json
  ⚡ scripts/airbrake.coffee
     ⚡ #45: Line exceeds maximum allowed length. Length is 140, max is 80.
     ⚡ #54: Line exceeds maximum allowed length. Length is 141, max is 80.
  ⚡ scripts/auth.coffee
     ⚡ #14: Line exceeds maximum allowed length. Length is 90, max is 80.
     ⚡ #72: Line exceeds maximum allowed length. Length is 103, max is 80.
     ⚡ #79: Line exceeds maximum allowed length. Length is 85, max is 80.
     ⚡ #89: Line exceeds maximum allowed length. Length is 103, max is 80.
     ⚡ #119: Line exceeds maximum allowed length. Length is 86, max is 80.
  ✓ scripts/deploy-announce.coffee
  ✓ scripts/events.coffee
  ⚡ scripts/google-images.coffee
     ⚡ #5: Line exceeds maximum allowed length. Length is 109, max is 80.
     ⚡ #6: Line exceeds maximum allowed length. Length is 131, max is 80.
     ⚡ #8: Line exceeds maximum allowed length. Length is 96, max is 80.
  ✓ scripts/help.coffee
  ⚡ scripts/httpd.coffee
     ⚡ #34: Line exceeds maximum allowed length. Length is 106, max is 80.
     ⚡ #37: Line exceeds maximum allowed length. Length is 95, max is 80.
  ✓ scripts/lgtm.coffee
  ⚡ scripts/maps.coffee
     ⚡ #20: Line exceeds maximum allowed length. Length is 88, max is 80.
  ✓ scripts/ping.coffee
  ⚡ scripts/pivotal_tracker.coffee
     ⚡ #33: Line exceeds maximum allowed length. Length is 196, max is 80.
     ⚡ #67: Line exceeds maximum allowed length. Length is 81, max is 80.
  ✓ scripts/pugme.coffee
  ⚡ scripts/roles.coffee
     ⚡ #16: Line exceeds maximum allowed length. Length is 128, max is 80.
     ⚡ #20: Line exceeds maximum allowed length. Length is 114, max is 80.
  ⚡ scripts/rules.coffee
     ⚡ #11: Line exceeds maximum allowed length. Length is 103, max is 80.
     ⚡ #12: Line exceeds maximum allowed length. Length is 125, max is 80.
     ⚡ #13: Line exceeds maximum allowed length. Length is 120, max is 80.
     ⚡ #17: Line exceeds maximum allowed length. Length is 88, max is 80.
     ⚡ #18: Line exceeds maximum allowed length. Length is 119, max is 80.
     ⚡ #19: Line exceeds maximum allowed length. Length is 121, max is 80.
  ⚡ scripts/sebastian.coffee
     ⚡ #29: Line exceeds maximum allowed length. Length is 82, max is 80.
  ✓ scripts/storage.coffee
  ⚡ scripts/translate.coffee
     ⚡ #5: Line exceeds maximum allowed length. Length is 111, max is 80.
     ⚡ #6: Line exceeds maximum allowed length. Length is 150, max is 80.
     ⚡ #86: Line exceeds maximum allowed length. Length is 93, max is 80.
     ⚡ #87: Line exceeds maximum allowed length. Length is 91, max is 80.
     ⚡ #113: Line exceeds maximum allowed length. Length is 96, max is 80.
  ⚡ scripts/travisci.coffee
     ⚡ #30: Line exceeds maximum allowed length. Length is 92, max is 80.
     ⚡ #66: Line exceeds maximum allowed length. Length is 156, max is 80.
  ⚡ scripts/youtube.coffee
     ⚡ #5: Line exceeds maximum allowed length. Length is 95, max is 80.

⚡ Warning! » 0 errors and 32 warnings in 23 files
```