No need for the short-term vars.
Can use $.attr for that.
Unused.
Can use $.attr for that too.

Saves 42 bytes!
Do all the jQuery stuff in one go.

Saves 23 bytes!
Can assign the instance variable and pass it to a function at the same time.

Saves 11 bytes!
Ternaryise.

Saves 9 bytes!
No need to store that in a variable.

Saves 8 bytes!
Use $.attr for this.

Saves 5 bytes!
Fix docs on registering your own chart type.
Use the tests' version of jQuery seeing as it's already there.

Makes it easier to work on offline.
Events aren’t namespaces any more.
Version 2.0.5.