Merge pull request #1646 from nnnick/fix/1640

Can now replace entire chart data object on the fly

diff --cc src/scales/scale.radialLinear.js
Simple merge

diff --cc test/controller.bar.tests.js
Simple merge

diff --cc test/controller.line.tests.js
Simple merge

diff --cc test/core.scaleService.tests.js
Simple merge

diff --cc test/scale.linear.tests.js
Simple merge