refactor/2.0.0
tests for linePlusBarWithFocusChart model
(cherry picked from commit 119929b)
refactor/2.0.0/pie-pieChart
tests for pie and pieChart
(cherry picked from commit 5a63891)
refactor/2.0.0
small changes
(cherry picked from commit 7e63bfa)
refactor/2.0.0
donut - small changes
(cherry picked from commit 8dda43c)
refactor/2.0.0
tests for sparkline
(cherry picked from commit 30a5725)
refactor/2.0.0
tests for stackedArea & stackedAreaChart
(cherry picked from commit 2e980da)
Merge pull request #560 from kashesandr/changes-pack-4

Changes pack 4