Bump Rack Timeout to 20 seconds.
Bump Rack Timeout to 20 seconds.

It was apparently too short and at least one request a day would hit
the 10 second threshold which we do not want.

See:
https://bugsnag.com/code-school/orientation/errors/54b8482342b309b2b65a6554
https://bugsnag.com/code-school/orientation/errors/54ae8a5f42b309b2b63f22f7
https://bugsnag.com/code-school/orientation/errors/54b563f542b309b2b651b643
https://bugsnag.com/code-school/orientation/errors/54b3b99142b309b2b64d0b0a
https://bugsnag.com/code-school/orientation/errors/54b5266c42b309b2b650d9ef

Scripted/orientation,cmckni3/orientation,codio/orientation,LogicalBricks/orientation,splicers/orientation,codeschool/orientation,codeschool/orientation,splicers/orientation,IZEA/orientation,cmckni3/orientation,orientation/orientation,twinn/orientation,Scripted/orientation,smashingboxes/orientation,jefmathiot/orientation,cmckni3/orientation,orientation/orientation,liufffan/orientation,codio/orientation,jefmathiot/orientation,liufffan/orientation,robomc/orientation,LogicalBricks/orientation,twinn/orientation,smashingboxes/orientation,orientation/orientation,friism/orientation,hashrocket/orientation,ferdinandrosario/orientation,Scripted/orientation,splicers/orientation,hashrocket/orientation,friism/orientation,orientation/orientation,codeschool/orientation,IZEA/orientation,ferdinandrosario/orientation,robomc/orientation