bumped version to 1.0.1
ignore test.png
added toBasis and fromBasis
Clarified behaviour of curveLength
made setAttribute part of the HasAttribute class
fixed a bug in toBasis and fromBasis

A basis is represented by three points, not a point and
two vectors! The reason for this is to make transformation
less awkward.
Implemented textures

The fill colour can now be parameterised (using the
Texture attribute) by the absolute and relative coordinates
of the point being filled. The relative coordinates
are relative to the TextureBasis attribute.