This release includes a few changes to how identify and track calls are made:
- Identify: only uses user info instead of user info and user attributes
- Identify: Attributes are passed in as one and the identify function determines if it's a top-level attribute or an attribute instead the `attributes` object.
- Track: Adding timestamp for all track event calls
Moving to 1.0.0 so that versions from here on don't have confusing numbers, based on [semver](http://semver.org/).