Add Stylus format
Modify Grid has-gutter pattern
Add Grid test
Add note:overflow-x by gutter
Delete some style
Add minify css
Add tests
Merge branch 'v.0.2.0'

* v.0.2.0:
  Add tests
  Add minify css
  Delete some style
  Add note:overflow-x by gutter
  Add Grid test
  Modify Grid has-gutter pattern
  Add Stylus format
Fix test bug