Do "ticking" inside glutin event loop

[jameshiew]

There is a Ticker::run func which runs a loop that calls a callback which then does rendering and calls event_loop.run_return to check for events such as key presses. A simple event_loop.run in the main thread could be used instead - the structure could match much more closely something like https://github.com/glium/glium/blob/master/examples/tutorial-01.rs