Overflow issue using full width

Hello,

I have discovered a little issue when I was trying to make a full width layout.

If you check my codepen --> http://codepen.io/andresgl/full/xZEyXR/ you can see a extra tittle right margin.

I have fixed it by myself changing the "margin-right" on .#{$toast-grid-column-namespace}

_(codepend SCSS line 187 and 188)_

`margin-right: -.3125em;`

instead of

`margin-right: -.25em;`

(5px) instead of (4px).

Maybe you can solve it in another way.

Thank you!

Reproduce the full-width layout using the linked CodePen, then inspect the SCSS at lines 187-188 for .#{$toast-grid-column-namespace}. Done means removing the extra right margin while keeping the grid layout aligned at full width.

Written by the indexing model from the issue text.