Add buildin timeout on verify_element command

There are times when I am executing verify_element on a web page which has already been loaded.  For example I want to validate that multiple items are present or not present on the page.

For items which are not present, I select the "Does not exist" flag and the test takes a long time to time out before moving to the next statement.   The current work around is to use the "set timeouts" command to shorten the time out, then reset it to the default.  

It would be convenient to have a way to set the timeout in the verify_element command.   Especially for a loaded page.   There is no advantage to have those checks a long time as though they were waiting for the page to load, and adds a long time to test execution.