Started refactoring of authentication screen

- Created new subdir in partials for authentication; updated app with new
  location.
- Rephrased "no authentication" message.
- Removed "Setup" and "Authentication" from all buttons
- Put buttons in a button group.
- Made button size and colors consistent: btn-sm, btn-primary.
Refactored "create authentication" forms

- Use "primary" as state for panel and save buttons.
- Make form styles consistent with rest of application.
Refactored HTTP Basic view/edit screens

- Use collapse directives to show remove/edit buttons
- Use "lock" icon
- Use "danger" state for remove button, form
- Use "success" state for edit form
- Table inline view in panel
- Make edit form conform to site
Moved http-basic views into their own partials

- new-http-basic for the form
- http-basic for the view/edit display
Moved HTTP digest views into separate partials

- and made the styles and interactions match those of HTTP Digest
Refactored OAuth2 into its own partials

- Unified look-and-feel with other authentication adapters