move reveal modals in docs.
Close sibling dropdowns on hover in top bar.
Fix reveal and dropdown demos based on doc layout changes.
Clean up topbar js formatting.
Added ditbi tool to readme
Merge pull request #2759 from roblevintennis/ditbi_to_readme

Added ditbi tool to readme
updated IE8 grid link
Dont overwrite padding-left and padding-right (you can use grid-column() now)