Update to Assets/Tokens/Library button graphics

[Valyar]

As requested, I updated the graphics of the Assets/Tokens/Library to be readable. I played with different colors, but in the end I decided to unify it with the grey leather of the Push button.
Let me know if you like this and I will make sure that it is pushed to the SVN next week (and will hit the LIVE channel the week after).

The screenshot is attached.

[bracken]

That looks great, Valyar, thank you.

[viresanimi]

I like it. Thanks!

[PhilAdams]

Much better! Thanks! :)

[gameraspinning]

Nicely done. Thanks!