Template engines

The oficial solution for using haml or slim from version 1.2 is: https://github.com/plataformatec/devise/wiki/How-To:-Create-Haml-and-Slim-Views

It's complicated learn this or open bookmarks and execute in all projects, with way we can use this

```ruby
rails g devise:views -t --template=haml 
```
or

```ruby
rails g devise:views -t --template=slim
```

In your gemfile you must have 

```ruby
group :development do
  gem 'html2haml'
end
```
or

```ruby
group :development do
  gem 'html2slim'
end
```