Added Google Chrome Hangouts icon (closes #782)
Added Swell Foop icon and new org.Gnome.Weather symlink (closes #790)
Added Nibbles, Robots, Tetravex icons (closes #790)
Corrected icon names for certain gnome games.
Added Four in A Row icon (closes #790)
Added Iagno icon (closes #790)
Added Klotski icon (closes #790)
Added Chess icon (closes #790)
Added LightsOff icon - Fixed Orange GB Gradient for Nibbles and originating Steam icon. (closes #790).
Merge pull request #791 from nathaneltitane/master

Gnome Games icons (request #790) + Chrome