don't hide xaxis labels of bar graph on small screens.
show group title in graph callout
allow touchstart event default action to restore scrolling
restore firefox compatibility
force IE9 to register mousemove events across full graph area.
do not use CSS baseline-shift to place bar text as it displays inconsistently across browsers
Merge pull request #70 from alphagov/graph-touch-fixes

Graph fixes
conversion funnel tweaks
fix failing feature tests