Add before and after screenshot events to the element event listener.

[renelux]

We need this method to make changes to the webpage before a screenshot gets taken. SeLion by default takes screenshots of the whole page (which we love). But a lot of websites nowadays are using floating headers/elements, this means that when the page is scrolled the header shows in the middle of the page.

This becomes a problem for the QA's that review the screenshots, with this change we can add a scroll up before the screenshot gets take, and scroll down afterwards.

[mach6]

@renelux will take a look at this soon. sorry I missed you on gitter

[renelux]

@mach6 no worries not in a rush. Issues is already identified just need to find a good way to fix it. This way would work (already tried it locally) you just need to approve it. No pressure ;)

[mach6]

@renelux I'm okay with this change.I'll merge it in the morning.

[mach6]

@renelux sorry, I just noticed. I need you to fix the author (~/.gitconfig user.email and user.name) of this commit so that it complies the project's contribution policy.

[renelux]

@mach6 I updated my commit info

[mach6]

thx @renelux .. you sure about the email address? this will be the 3rd address the history has for you. :)

[renelux]

@mach6 sometimes I work on my PayPal machine and sometimes on Symbio's that is why it is not always the same :) The paypalcorp.com are the new address I think, but @paypal.com still works so I can change it for you.

[renelux]

@mach6 I updated my email again.

[mach6]

this is merged.