Closes #55. Allows you to set the primary color.

[bookstack] / package.json

{
  "private": true,
  "devDependencies": {
    "gulp": "^3.9.0"
  },
  "dependencies": {
    "angular": "^1.5.0-rc.0",
    "angular-animate": "^1.5.0-rc.0",
    "angular-resource": "^1.5.0-rc.0",
    "angular-sanitize": "^1.5.0-rc.0",
    "babel-runtime": "^5.8.29",
    "bootstrap-sass": "^3.0.0",
    "dropzone": "^4.0.1",
    "laravel-elixir": "^3.4.0",
    "zeroclipboard": "^2.2.0"
  }
}