fix issue #1035 - questions inside groups cant be dragged horizontally
=fix for #1086 - Add-new-question button cant be clicked in all areas
=fix for #972 - settings box in groups doesnt use full width
=potential fix for #970
fix for #970 - styling for group + buttons and group nesting
minor fix
fixes for #910 - skip logic styling
Merge pull request #360 from kobotoolbox/styling

Fixes to UI issues (1035, 1086, 972, 970, 910)