WIP
wip
wip
wip
WIP

 - patched up issue with extra calls to update_limits
ENH : improved the demonstration code

 - changed from stack of arrays to object with `__getitem__`
   defined
 - changed to sinusodal functions from Gaussian
ENH : moved the frame slider to ctrl box
Merge pull request #2 from tacaswell/wip

Wip