Updated ignore list, to get rid of some new log files apparent in CEF3.
The "out" folder contains the target folder for compilation, which we don't want to include either.
How's this for a hack… We use the Release libcef.dll now, even when running in Debug, since the Debug libcef.dll is huge (180 MiB) and can hence not be version-controlled using GitHub. This works OK for now.