1.0.0

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.