Remove Scrollbars

Since the individual slides use partial pixels for their width but the
wrapping embed iFrame does not, some browsers will round these partial
pixels up and thus render slides that are 1 pixel larger than the embed
window. To prevent the iFrame from presenting scrollbars in this
situation, we merely add overflow: hidden to the container.
Merge branch 'hotfix/scrollbars'
Version bump
Grunt 1.3.2