clear main timeout on end
clear main timeout on end

the function registered to nodejs's event queue with setTimeout
is never terminated. therefore nodejs process never ends
even after the promise is resolved and it'll wait untill the callback
function get executed. this a fix to this issue.

monolithed/webdriverio,sebastiendavid/webdriverio,Pitzcarraldo/webdriverio,testingbot/webdriverjs,Pitzcarraldo/webdriverio,monolithed/webdriverio,testingbot/webdriverjs,sebastiendavid/webdriverio