io.js logo proposal 2

Second attempt at the io.js logo. Notes:

- I decided to get rid of the hexagonal shape and try out an actual circle.
- Slightly shifted the 'io' text to the left so that the 'o' is in the middle of the bigger Black circle.
- The whole thing somehow looks like an old record player.
- Morphed the 'JS' text on top of the circle and aligned along the perimeter.

Relevant GitHub issue: https://github.com/iojs/io.js/issues/37