chrome_plugin to trace mouseover in the webpage

Signed-off-by: algoinfo<windnetv@sina.com>
add context menu
---<windnetv@sina.com>---
add context menu
Signed-off-by: algoinfo
---<windnetv@sina.com>---
setDataset

algoinfo
<windnetv@sina.com>
algoinfo
<windnetv@sina.com>
Merge pull request #10 from algoinfo/master

Heatmap for chrome plugin