Use includePaths to import Bourbon

[vlasscontreras]

When using simpleLightbox as dependency, and importing simpleLighbox.scss to the main stylesheet of the project, Sass returns an error about importing the '../node_modules/bourbon/app/assets/stylesheets/bourbon' because is a relative path and won't refer to the same file all the time.

Using includePaths allows to use @import 'bourbon'; without errors.