add mouseover to vegaliteplot.js
add mouseover to vegaliteplot.js

vega/polestar,smartpcr/polestar,sandbox/polestar,uwdata/polestar,dennari/hack-n-hackers-polestar,pallavkul/polestar,dennari/hack-n-hackers-polestar,zegang/polestar,sandbox/polestar,uwdata/polestar,jsanch/polestar,vega/polestar,vivekratnavel/polestar,jsanch/polestar,hortonworks/polestar,pallavkul/polestar,smartpcr/polestar,pallavkul/polestar,smartpcr/polestar,jsanch/polestar,uwdata/polestar,vivekratnavel/polestar,vivekratnavel/polestar,dennari/hack-n-hackers-polestar,hortonworks/polestar,sandbox/polestar,zegang/polestar,hortonworks/polestar,vega/polestar,zegang/polestar