Updated 'Click Element At Coordinates' keyword and related tests. Require
coordinated arguments to be numeric type and thus removed conversion of
coord values to integers. Temporarly added alternative methods for clicking
element, testing out alternative methods and results. Rewrote test javascript
as I couldn't figure out what the original code was intended to accomplish
and when ran manually the test wasn't verify what it was intended to verify.
Made the image element the clickable object as div tags are not clickable.
Updated test to reflect changes above.