fix(uiGridMenu): Set box-sizing: content box

This fixes an issue where IE was calculating the width of the menu element
to low.
Release vv3.0.0-rc.12
Release v3.0.0-rc.12
Update release process notes

[skip ci]
fix(AutoResize): Redraw all of grid on resize.

The grid dimensions were the only thing being adjusted (which is what
queueRefresh() does). Changed to refresh() to update the visible
rows/columns.

Fixes #1770
Merge branch 'master' of https://github.com/angular-ui/ng-grid