fix mocha example (#1299)
fix mocha example (#1299)

webdriver must be created asynchronously 
Blazemeter/taurus,greyfenrir/taurus,greyfenrir/taurus,Blazemeter/taurus,greyfenrir/taurus,Blazemeter/taurus,Blazemeter/taurus,greyfenrir/taurus,Blazemeter/taurus,greyfenrir/taurus,greyfenrir/taurus,Blazemeter/taurus,Blazemeter/taurus,Blazemeter/taurus,greyfenrir/taurus,greyfenrir/taurus,Blazemeter/taurus,greyfenrir/taurus