Increase the speed of PageElement.isDisplayed

[dougnoel]

Likely the same fix as for #185

PageElement.isDisplayed() is called by VerificationSteps.verifyElementIsHidden() it takes a timeout Parameter in seconds, set to 1 second if we expect it to fail, and 10 if we expect it to pass.

The isDisplayed() functionality uses a FluentWait that only checks every 500 milliseconds. It also times out after 5 failed exceptions are thrown. It should be checking every 10 milliseconds. If a zero is passed, it should check once then fail immediately. Otherwise, it should continue checking until the time it out.

verifyElementIsHidden should also pull the timeout from the ConfigurationManager.