Add stone editor to wand factory

[samepant]

this also:

• stores Wand settings in the URL to make sharing of edits easier (and testing between browsers)
• changes emboss filter to use turbulence
  • We need a more cross-browser friendly way of getting interesting emboss effects, and feTurbulence should help

[samepant]

Added an alternative UI for the Rhythm value, a little easier for us Visual People lol