update rspec and model
new feature : auto title
update new link view
add random hash
add fast url generation
update permission for fast url
add google analytics
Merge branch 'release/v1.2'

* release/v1.2:
  add google analytics
  update permission for fast url
  add fast url generation
  add random hash
  update new link view
  new feature : auto title
  update rspec and model