migrated erb to haml

http://wheel-remove-erb-use-haml.herokuapp.com/

used https://github.com/dhl/erb2haml script for migrating the files
@vipulnsward I have intentionally not converted this, else wi would look something like this,
```ruby
%button.navbar-toggle{"data-target" => ".navbar-collapse", "data-toggle" => "collapse", type: "button"}
```

It seems bad  to use both `:` and `=>` in a same hash.