Scroll prevention utils methods
When a vex dialog is opened, prevent scroll by default
Make `pre` scrollable in JSON vex dialogs
Add `.visible-large-desktop` responsive class (similar to `.visible-desktop`)
Better nav styles
Apply responsiveHack to `.row-fluid`s  all the way up to `1200px`
Better `.empty-table-message` styling
Better responsive styles for tables
Remove old `pre` styles comment