Remove unused guid dependency

package.json

@@ -37,7 +37,6 @@
     "fuzzaldrin": "^2.1",
     "git-utils": "^3.0.0",
     "grim": "1.1.2",
-    "guid": "0.0.10",
     "jasmine-json": "~0.0",
     "jasmine-tagged": "^1.1.4",
     "jquery": "^2.1.1",

src/display-buffer.coffee

@@ -1,6 +1,5 @@
 _ = require 'underscore-plus'
 EmitterMixin = require('emissary').Emitter
-guid = require 'guid'
 Serializable = require 'serializable'
 {Model} = require 'theorist'
 {CompositeDisposable, Emitter} = require 'event-kit'