Atrament v1.0.0

First major version bump of Atrament is here!

This version brings breaking changes to the API and new features, such as:

• getting rid of the atrament factory function, and replacing it with the new Atrament(... constructor
• adding a proper events system with new events such as
  • strokestart/strokeend
  • fillstart/fillend
  • strokerecorded
• By recording reconstructible stroke data, it's now possible to implement undo/redo functionality, as well as canvas transforms on top of Atrament
• making the smoothing parameter a number, which means developers can fine tune their desired smoothing intensity