Gathering a test set of SVGs to implement regression tests

[mathandy]

I'm gathering a collection of SVGs to run regression tests with.

My rough plan is that these tests will check two things:

1. That SVGs that parsed before still parse.
2. That the data that comes out is approximately the same and has the same type.

If you have any SVGs you'd like to be included (or think would make for a good test), please attach them to a comment here.