refactoring
refactoring - `tooltipContent` moved to the Chart.js
refactoring - clean up
refactoring - clean up
refactoring - cosmetic
refactoring - getStatesManager moved to the Chart.js
Merge branch 'canvas' into refactoring
Refactoring - getStatesManager moved to the Chart.js.
Removed margin resets in charts.
Refactoring - cosmetic in cumulativeLineChart
Refactoring - clean up private variables
added comments
cosmetic refactoring
Merge pull request #52 from kashesandr/refactoring

refactoring / cleaning up the models