Update axis label dimension calculation to use tick values
Add test checking axis calculation uses tickValues
Update Change log
Merge remote-tracking branch 'scottlogic/develop' into develop
Address issues raised on PR

- Updated Changelog
- Added comments
- Added additional test
Update test to cover all returned values
Merge pull request #174 from matthewdunsdon/develop

Margin widths not taking account of tick labels
Merge pull request #172 from tpkelly/develop

Fix selection shading
Merge branch 'upstream' into develop