Revert settings back to objects
Remove support for IE7 edit
[fix] Rename private methods in grid

This got forgotten when @clear-y’s big PR got merged
[test] init, column, span
Merge pull request #317 from mojotech/cs/tests

Fix @clear-y's PR and basic test suite
[test] shift
Add offset mixin

- Takes a ratio & gutter
- Can also specifiy if it's a column or span