New demo files
Changed set color method so it changes the color of text and the fill in wedges.
Sketches can now include wedges of type "hash". This type uses an svg mask to hide parts of the wedge. The mask follows the wedge when it is reflected or moved.
Merge branch 'upstream/master'
Image viewer test now includes a slider control. Moving the slider changes which image is currently selected, and selecting images with the mouse also changes the slider value.
Merge pull request #38 from jvish/review

Review