Update demo with new data-attributes method of parsing settings.
Add script to display settings for each clock.
Ensure a string is always passed when drawing text.

This stops some libraries like excanvas or flashcanvas from
attempting to apply string methods to a number.
Remove hacky close of arc() for IE by asking to be drawn clockwise.

excanvas stops start and end radial values being the same if the
arc is being drawn counter-clockwise, which is the default. This
meant the gap had to be manually closed.

Drawing clockwise by passing true as last parameter to arc() has
solved this.
Ensure x value in drawTextAt() method is always a number.