Vectorized and re-rendered icons!

I took the liberty to create vector versions of the existing icons and re-rendered them. All the missing @2x sizes have been added as well.

I did not include the texture effect on the icon because OS X 10.10 will be out tomorrow and it will probably be much flatter than Mavericks. (I'm lying, I couldn't reproduce the texture on Illustrator xD But I think it still looks nice haha.)

I have also included the `.ai` and `.svg` source files if you wish to modify them now or later.

Hope you like it :)