keenio: begin update to 3.0 for #327
Merge branch 'master' into update/keen
keenio: upgrade to 3.0.5
keen: load keen-tracker by default, otherwise if they have a readKey then load the full 600kb keen
keen-io: add test for both keen.min.js and keen-tracker.min.js
keen-io: add support for addons! for #358
Merge pull request #348 from segmentio/update/keen

keenio: begin update to 3.0 for #327