Update reverse approach

Use rtl to ptr to achieve reverse directions for columns at small
views. This approach preserves .row widths in hybrid and fixed.
Make min-height on main default behavior
SASS output
Remove font weight from reset

This is causing havoc with bold and strong within phrasing elements
Simplify reverse functionality, make padding margin
Fix reverse again

Still can’t penetrate flex box. A more complicated approach must
remain. Gutters are wrong when columns reversed.
Remove max-width from .unbound images
Give unbound images auto height
Refactoring gruntfile

Removing stale code and unhelpful comments. Formatting. Build path
variable. DRYing up custom tasks. Adding clean task, so builds are
consistent.
Merge pull request #107 from doingweb/refactoring-gruntfile

Refactor Gruntfile
Adding the csslint Grunt task

Introducing CSSLint for cleaner CSS! We JSHint, so why not CSSLint, too?