Add zen-compare-units() function.
Add $zen-gutter-method to zen-unit-width().
Add $zen-gutter-method to zen-grid-container().
Add $zen-gutter-method to zen-grid-item-base().
Add $zen-gutter-method to zen-grid-item-width().
Add $zen-gutter-method to zen-grid-item().
Add $zen-gutter-method to zen-grid-background().
Add $zen-gutter-method to zen-grid-flow-item().
Add feature for margin-based gutters with padding-less grid items. Fixes #23
Bugfix: background image fails when gutter method is padding and gutters are percentage-based.
Zen Grids 2.0.0-beta.1 is the next release of a major refactoring of Zen Grids.

Changes since 2.0.0-alpha.2:
- Bugfix: Allow $zen-float-direction to affect display of numbers in
  zen-grid-background() mixin.
- Change zen-clear's $float-direction paramter to $direction.
- Convert $zen-column-count to $zen-columns.
- Convert $zen-gutter-width to $zen-gutters.
- Convert $zen-float-direction to $zen-direction.
- Convert $zen-reverse-all-floats to $zen-switch-direction.
- Convert $zen-auto-include-item-base to $zen-auto-include-grid-item-base.
- Rename zen-direction-flip() function to be zen-direction-switch().
- Rename zen-clear() mixin to be zen-new-row().
- Rename zen-grid-flow-item()'s $parent-columns parameter to $parent-column-span.
- Add feature for margin-based gutters with padding-less grid items.
- Bugfix: background image fails when gutter method is padding and gutters are
  percentage-based.

Changes since 2.0.0-alpha.1:
- Remove zen-nested-container().
- Add $context parameter to zen-grid-container() so it can be used: without
  context, on grid items, or on elements in the normal flow inside a grid item.
- Add proper Sass 3.2 dependency.

Changes since 1.3:
- Zen Grids is now also a Bower component.
- Add mixin for grid background images for use durin development.
- Move zen-grid-flow-item() and zen-float() to a new zen-grids/flow module.
- Use simplified -100% margins.
- Change @import "zen" to @import "zen-grids" to make installation more natural.