Disable power save app suspension

[julianhille]

Long running tests or test that need to wait for a given time could lead to the OS suspend the app or reduce its cpu time.
This leads to lesser precision for setTimeout or setInterval execution.

Fixes #128

[inukshuk]

Looks great, thanks!

[julianhille]

Thanks for fast review/merge/release!

[inukshuk]

By the way, I think timing issues may get worse with background throttling being added to Chrome (not sure exactly which version of Electron this applies to, but you can use a command line switch to turn it off).

[julianhille]

You are right, this will only apply to the renderer process right?
But these should be set: --disable-background-timer-throttling and maybe also: --disable-renderer-backgrounding

[inukshuk]

Yeah, that's my best guess also, not having played around with this. If you notice issues, you can set command line switches using the --require-main hook of Electron-Mocha.