improved zoom
added bower and Q
asynchronous computation in web worker

to be able to cancel jobs
can "cancel" jobs now

Technically it's not really a cancel since I let the current jobs
complete and discard their results.
It's still good enough though.
fixed firefox event handling
better colors (at least for green)
improving zoom
zoomIn is now progressive
zoomOut has a preview like zoomIn

Plus some minor other changes and cleanup.
Start to add controls
Reset button, add hash changes to url

Can now link a cool part of the fractal using the url ^^
add control to increase resolution

On a side note, the code start to get bigger and bigger. Need to
refactor that into a nice class soon.