(feat/languageMap) Fixed comments
(feat/Barchart) Add test bar chart.
(feat/linechart) Add test line chart.
(cleanup) Delete map_test.html.)
(feat/piechart) Add test pie chart.
(feat/stackedAreaChart) Add test stacked area  chart.
Merge pull request #31 from wykhuh/feat/stackedAreaChart

(Feat/stackedAreaChart) Add test stacked area chart.