Document how consuming application should reference .LESS files

[notmessenger]

@import 'sl-ember-components';

[zcourts]

What's the recommended approach for doing this when your application uses sass instead of less?
For now, I've just built the CSS, put it into sl.scss and imported it.

[notmessenger]

ember-cli/ember-cli#1918 may be (part of) the answer

[notmessenger]

ember-cli/ember-cli#3490

[notmessenger]

All of the issues being worked in the v0.11.0 milestone are to address the issue of styling and playing much nicer with consuming applications. Specific to this issue, and supported by work in other issues, ace6e5e is the answer to this issue's question.