Merge pull request #19 from wush978/master

resolve #17
Update for ECharts 2.4.0 release and resolve issue #17 encoding confilct.

Update for ECharts 2.4.0 release and resolve issue #17 encoding
confilct.
Remove footer to make chart clean

Remove footer to make chart clean
Update for ECharts 2.4.0 release

Update for ECharts 2.4.0 release