Merge pull request #262 from jrconlin/dev

Fix create_db.sql to match current state
Removed background for mobile breakpoints.

Should fix issue with flickering on FxOS devices.
Disabled csslint in the css grunt task.
Increased sleep time on travis before testing.
Merge pull request #273 from mozilla-services/issue-272-fxos-flickering

Removed background for mobile breakpoint
resolving main.css
Merge pull request #267 from pdehaan/scsslint

tweaking the Sass per scss-lint rules