@0.5.0 release
@0.5.0 release

ralphtheninja/abstract-leveldown,ralphtheninja/abstract-leveldown,calvinmetcalf/SQLdown,calvinmetcalf/SQLdown,bigeasy/abstract-leveldown,bryce-gibson/SQLdown,bryce-gibson/SQLdown,shimonenator/couchbasedown,watson/abstract-leveldown,Level/abstract-leveldown,snowyu/node-abstract-nosql