Use vendor prefixes to reset box-sizing.
Use vendor prefixes to reset box-sizing.

Firefox and older webkit doesn't understand "box-sizing: content-box", but do have vendor prefixes for it.

Bootstrap >= 3 sets the box-sizing to border-box using vendor prefixes and messes up the tabs layout, forcing us to use
them to reset it.  First reported in #32.

dannguyen/document-viewer,documentcloud/document-viewer,mr-justin/document-viewer,mr-justin/document-viewer,dannguyen/document-viewer,dannguyen/document-viewer,documentcloud/document-viewer,documentcloud/document-viewer,mr-justin/document-viewer