Crash when alt-tabbing in Windows 10

[Evan Markowitz]

When alt-tabbing out of SphereFace, the game crashes. The console says it attempted to set the size to 0,0 (minimizing?) and then it crashed out and needed to be restarted.

New window size [0,0] aspect ratio nan

[Riot]

Check operating system reported window size for unreasonable values and ignore them, resolves #116

→ <<cset 6e58378f5eef>>

[Riot]

Removing milestone: Beta (automated comment)