Add dropdowns documentation

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+# Dropdowns
+
+
+## How to style a bootstrap dropdown
+1. Use the HTML structure provided by the [docs][bootstrap-dropdowns]
+1. Add a specific class to the top level `.dropdown` element
+    
+    
+    ```Haml
+    .dropdown.my-dropdown
+      %button{ type: 'button', data: { toggle: 'dropdown' }, 'aria-haspopup': true, 'aria-expanded': false }
+        %span.dropdown-toggle-text
+          Toggle Dropdown
+        = icon('chevron-down')
+    
+      %ul.dropdown-menu
+        %li
+          %a
+            item!
+    ```
+
+    Or use the helpers
+    ```Haml
+    .dropdown.my-dropdown
+      = dropdown_toggle('Toogle!', { toggle: 'dropdown' })
+      = dropdown_content
+        %li
+          %a
+            item!
+    ```
+
+1. Include the mixin in CSS
+
+    ```SCSS
+    @include new-style-dropdown('.my-dropdown ');
+    ```
+
+[bootstrap-dropdowns]: https://getbootstrap.com/docs/3.3/javascript/#dropdowns