feat(login): add remember me functionality

[remicastaing]

• replace ngCookies by ngStorage: ngCookies only supports session
  cookies; ngStorage supports both local and session storage
• add remember me checkbox in login.html and login.jade
• pass remember me parameter to auth.service in login.controller
• replace $cookieStore by $localStorage and $sessionStorage in
  app.js/coffee
• replace $cookieStore by $localStorage and $sessionStorage in
  auth.service.js/coffee
• add an expire parameter to signToken method in the server side
  auth.service.js

Notes:

• $sessionStorage is used when « remember me » is not checked
• $localStorage is used when « remember me » is checked
• with « remember me » checked, the token will expire after 7 days

Closes #259 (partly)

[DaftMonk]

You'll need to add ngstorage to the fixtures to get the tests to pass: https://github.com/DaftMonk/generator-angular-fullstack/blob/master/test/fixtures/bower.json

[remicastaing]

I added ngstorage in test/fixtures/bower.jsonand also in app/template/karma.conf.js. But it didn't work.

I don't understand npm test fails:

1) angular-fullstack generator running app "before each" hook:
     Error: ENOENT, no such file or directory '/Users/remi/Workspaces/JS/generator-angular-fullstack/test/fixtures/node_modules'
      at Object.fs.lstatSync (fs.js:684:18)
      at Object.copySync (/Users/remi/Workspaces/JS/generator-angular-fullstack/node_modules/fs-extra/lib/copy.js:61:18)
      at Context.<anonymous> (/Users/remi/Workspaces/JS/generator-angular-fullstack/test/test-file-creation.js:85:10)
      at Hook.Runnable.run (/Users/remi/Workspaces/JS/generator-angular-fullstack/node_modules/mocha/lib/runnable.js:211:32)
      at next (/Users/remi/Workspaces/JS/generator-angular-fullstack/node_modules/mocha/lib/runner.js:249:10)
      at Object._onImmediate (/Users/remi/Workspaces/JS/generator-angular-fullstack/node_modules/mocha/lib/runner.js:261:5)
      at processImmediate [as _immediateCallback] (timers.js:336:15)

[meeDamian]

1. cd test/fixtures && npm update && bower update && cd ../..
2. npm test

[remicastaing]

Yabadabadooo! Thanks @DaftMonk, @chester1000. It works both locally and on Travis.

[DaftMonk]

I can't check this out locally. It says Branch "remember_me" does not exist in the repository.

[remicastaing]

Sorry, I removed it accidentally from my github repo.

[remicastaing]

Her, a new PR: #415