Art and image updates

Adds an initial ViNo logo and background art, along with a different
type of image viewer that is used when the image should scale to fill
the window (not the other way around).
Icon/Logo and Non Proportional Scale on Main Menu

Closes #9 and #13.
Merge pull request #15 from Spekular/live

[0.2.1] FillViewer, Logo, and Non-proportional Scale