Reworked demo and new getSrc() method

Demo rework (#19)

* cleaned up demo

* presets rework, tidier

* version bump due to new API features

Corrected npm main script

as in #18

internalized shaders

v0.1.1

version bump (#16)

Rectangular images fix

v0.0.2

Update package.json

Initial release

v0.0.1

readme changes