new data for basic visualization

Add df and browser_table
new
Revert "new"

This reverts commit 5ddb6bb95a4eca93e87f6e627044bbc943cbdf0c.
Merge pull request #80 from wush978/master

Update slides
Merge pull request #83 from wush978/master

resolve #82
Merge pull request #81 from KuiMing/master

new data for basic visualization