Hologram 202

## OHMEGERD DACHUMENTZ

Moving away from jekyll docs to [hologram](http://trulia.github.io/hologram/) docs, which are generated from structured Sass comments.

**NOTE:** this pull request is so we can catch broad/big issues before merging. Let's try to iterate on this new documentation to improve it; a rough version to start should be fine.

### Versioning changes
* compiled css is no longer versioned
* compiled documentation is no longer versioned

### Desktop/Mobile documentation
This branch builds two separate sets of documentation, for the two different compiled versions of Sassquatch:

* `[root]/doc_desktop/`
* `[root]/doc_moible/`

### Local dev changes
Hologram builds static docs, so you don't need to run a server.

```
# compile sass
rake sass 

# build docs
rake hologram

# build everything
rake

# push docs to live (run in master)
rake push_docs
```

### gh-pages launch changes
At the present moment, we can't push branch-specific documentation to `gh-pages` with hologram. We can fix this later if it's a problem. Building locally is a bit easier, so that should help in the meantime. 

The  `push_docs` task pulls the latest from `sass/` on `master` into `gh-pages`, then runs `rake`. Navigate to `http://meetup.github.io/sassquatch/doc_desktop/` or `http://meetup.github.io/sassquatch/doc_mobile/` for live docs.

### Sass changes
This branch includes a few Sass changes, including some new (very beta) selectors for doc-* (docStripe) layout. No breaking changes or changes to patterns in production should have been introduced.