fix search bug.

thanks for report!: https://twitter.com/minpou_/status/513756250241130496
add releases information.
enhance cursor accuracy.
change / api to /table.
digitize cursor line.
fix x axis.
add release line.
rename 3tables to rankingTables.
add active api.
concurrent query in rankingTables.
add active table.
add microdata to package.html.
fix category itemprop name.
add microdata to rankingTable.
enhance cursor line behaviour.
add meta tag.
add query language.
enhance search box behaviour.
add license to ranking api.
add maintainers/license to detail/search page.