Grip v0.2.2

Fix content-right & content-center grid cell modifiers

Grip v0.2.1

Fix removal of responsive helper

Grip v0.2.0

Change default gutter width to 16px
Change default class style to percentage
Add content-center grid cell modifier
Add content-right grid cell modifier
Remove responsive helper
Rename rev grid modifier to reverse

Grip v0.1.0

Clone of Avalanche grid system w/ minor adjustments