Do not export paper.load() any more.

Use paper.PaperScript.load() instead.
Clean up code.
Move named inner functions out of nested scopes, to prepare for 'use strict;' transition.
Clean up code.
Replace accidentally checked in compiled library with load.sh version.
Make equals() for unit tests more clever.

Supporting tolerance for numbers, and calling of #equals() on expected value.
Implement unit tests for Matrix#getRotation() and #getScaling().

Of which one test is failing.