Additional components

## TODO

- [ ] Update / Verify that the cdn_helper is capable of including Font Awesome

- [ ] Buttons
  - [ ] Button dropdown
    - [ ] With header label
    - [ ] Dropup variation
    - [ ] With disabled items
  - [ ] Button groups
    - [ ]  With icon-separator
    - [ ]  With size
  - [ ] Button toolbar
    - [ ] Button nesting
    - [ ] Vertical variation
    - [ ] Justified

- [ ] Input
 - [ ] Input groups
 - [ ] With checkboxes/radio 
 - [ ] Button addons
   - [ ] With dropdown
   - [ ] With segmented buttons

- [ ]  Nav
  - [ ] Pills
  - [ ] Tabs
  - [ ] Disabled links
  - [ ] Breadcrumbs
  - [ ] Pagination
  - [ ] Pager
    - [ ] Aligned pager

- [ ] Jumbotron

- [ ] Thumbnails
  - [ ] Custom content

- [ ] Progress bars
  - [x] With label
  - [x] With color
  - [x] With stripes 
  - [x] With animation
  - [x] With stacks

- [ ] Media object
 - [ ] Media list

- [ ] Panel 
 - [ ] With table
 - [ ] With list group

- [ ] List group (see implementation of panel)
  - [ ] With badges
  - [ ] Custom content
  - [ ] Disabled content
  - [ ] Coloured content

- [x] Well
- [ ] Responsive embed