Allow access to lines of CSS file in Engine
Allow access to lines of CSS file in Engine

To give linters the ability to inspect individual lines of a SCSS
document, a `lines` accessor was added. This allows greater visibility
into aspects of the document that are lost in the abstract syntax tree
(e.g. whitespace).

Change-Id: Ifffc39bcebf04628cbf99be0bc3efd7e212299cf
Reviewed-on: https://gerrit.causes.com/16562
Reviewed-by: Greg Hurrell <79e2475f81a6317276bf7cbb3958b20d289b78df@causes.com>
Tested-by: Shane da Silva <6f6e68d1df92f30cb4b3ce35260ddf94a402f33d@causes.com>

artemartemov/scss-lint-hdm