Enhanced line specs to have 5 points
Have a gap in line when data is missing
Extract common usage of view
Remove unused function
Add terminator to lines, in gaps
Simplify getting X and Y coordinates
Simplify render logic
Join together selection enter and exit
Split line and terminator rendering to new class
Remove existing terminators when rendering
Rename allowNull to allowMissingData
Merge pull request #205 from alphagov/add-gap-to-line-graph

Add gap to line graph
Makes onHover test more readable
Introduce param to allow hovering over missing data
Handle null as missing data when formatting label
Style no-data display
Merge branch 'master' into fix-double-decker-missing-data
Don't display hover over missing data