Small tweaks and fixes to the styled-text module

All sheet tabs now have a bottom border

Looks good to me. 

I had tried to remove it, thinking the `csrf` one wasn't used because
`identity` used `csrf_token` but unfortunately the `session` module
still used `csrf` and deleted it from the model during the response
transform. Instead, let the `csrf` value stick to the model to be
available on session object and mark the `csrf_token` value as the
deprecated one in the backend. Support for that will drop further in
the future.

Fix responsive styles when running Sass >= 3.4.

In Sass 3.4 the index() function now returns null instead of false. So
we just perform a truthy check in the respond-to mixin rather than a
direct comparison.

http://sass-lang.com/documentation/file.SASS_CHANGELOG.html

* Same padding to top/bottom of tags.
* Remove unused styles.
* Apply consistent padding/margins and remove extra margin above
  first line of tags.
* Update pattern library.

We're parsing the search expression for " and ' characters
to treat the text between the quotes as one unit.
But this wasn't working well, when there was a facet before the quoted part,
the quote characters were leaking into the search as meaningful characters.

I.e. tag:"no way" , the system was looking for '"no way"', instead of just 'no way'.
This has been fixed

With this proper working tag-search,
when the tag has space characters, is just adding two extra quotes.

Fix #1431

We now use the styled text module here and overwrite it to work with
larger copy.

 * Move the styled-text module into it's own file.
 * Add markdown examples to the pattern primer.
 * Fix list item, blockquote and code styles.
 * Improve font sizing of heading elements.
 * Ensure code, serif and sans-serif are rendered at similar sizes.
 * Style sub lists.

This isn't the most elegant thing. It may be time to drop
angular-bootstrap. Ah, well.

Add markdown preview, add markdown help icon, and adjust styles for markdown output

Tag Styles

The selectors and markup here could use a cleanup, but at least now
collapsed annotations that have markdown lists and things will still
collapse.

Tags Redux: styling tags

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