coins received sound changed to familiar digital coin sound

The current sound effect when a payment is received resembles the idea of an old fashion bunch of heavy metallic coins colliding.
I believe a digital currency such as bitcoin needs a sound different from a real world object, something "light", "fast" and most importantly "digital". Therefore I suggest to change the current sample for a worldwide recognisable 2-notes sound that expresses all this properties. The sound notation 
is described in the sheet music below.
![coin-sound](https://cloud.githubusercontent.com/assets/655726/3007739/a349550e-de9b-11e3-93b0-2e518062309f.png)


Cons:
* Nintendo suing you for copyright infringement

Pros:
* Nintendo suing you for copyright infringement (that's a lot of new downloads)
* New sound sample is 41KB vs the previous 82KB file (50% reduction!)