Bump version to v0.9.14
Improve build script to include dist file in paperjs.org website.
Remove Base.merge() and use a new Straps.js feature instead.

A more clever Base() constructor that allows merging.
Remove unnecessary Color#clone() since it's doing the same as Base#clone() now.
Implement Item#data cloning.

Closes #340.
Merge git://github.com/paperjs/paper.js