update grid-units to have IE-specific widths, and use new grid classnames
prettify spaces and braces
Remove CSSLint ignore + s/default-*/pure-d-*

The .default-* classnames should be prefixed with .pure-
However, .pure-default-x-y seems too verbose, so I changed
it to .pure-d-x-y.
Change default classnames back to .pure-u-*

After thinking about it, it makes sense to just keep
these as .pure-u-* to preserve back-compat and so that
people don't get confused with the fact that these units
are the "default" units.
add back common rules for all grid units
Remove Normalize.css from `src/`, it's a dependency not Pure source code

This also removes `forms-core.css` which was effectively Normalize.css'
form related styles prefixed with `.pure-form`.
Update npm dependencies
Lock down the version of Normalize.css to 1.1.2
Simplify Grunt tasks and include Normalize.css import by default

Running `grunt` will now use Bower to install Normalize.css. As of 1.0.0
Bower got much faster, and it also uses a cache so the install only
happens once.

Added `grunt build` which does not the "import" or "test" tasks.
Tweak formatting and remove unused stuff in Gruntfile
Use bower.json to get current Normalize.css version number
bump up decimal places to 4 units, remove *width for `pure-u-1`
update HISTORY.md with fix for #154
Merge branch 'grids-ie7-fix'

Conflicts:
	HISTORY.md
Specify font stacks for grids and grid units

By setting _specific_ font stacks grids, it can be assured that the
letter and word spacing will be applied correctly. The font stack for
grid units is then set back to `sans-serif`, which is also the default
font stack that Normalize.css applied to the `body`.

Closes #41
revamp grids manual test
Merge pull request #169 from tilomitra/grids-test

revamp grids manual test
Remove -webkit-font-smoothing: antialised
Added unminifed roll-up of everything. 'pure.css'.
Fix image resizing to be proportional

Images inside .pure-g-r when resized didn't change their height. Fix this by adding setting their height to 'auto'.