Fix removing bound data on destory.
Ignore tab key when modifier keys are down.
Merge pull request #85 from ranvis/mod-tab

Ignore tab key when modifier keys are down.
Merge pull request #84 from ranvis/fix-destroy

Fix removing bound data on destory.
Add ga-beacon
Fix #51 support manual triggering
Support query-less triggering
Update README.md and demo
Bump the version to 0.2.2