InSkin Bid Adapter: add user syncing

[jgrimes]

Type of change

• Other

Description of change

Adds in several user sync URLs for image and iframe based user syncing.

[jsnellbaker]

Hello @jgrimes ,

These changes do LGTM, however I did notice something that I wanted to run by you.

While testing on the hello_world page with your adapter's test data, I saw the pixel URL for https://e.serverbid.com/ was being loaded twice per page load. When I specifically disabled the pixel userSync via the config options, the URL was still there (I assume it's part of the ad?).

Is this expected? I was concerned it may double your tracking metrics. Please let me know when you can.

[jsnellbaker]

Hello @jgrimes ,

When you have the chance, can you review the question above? The PR looks good, but I wanted to confirm with you on this outstanding point. Thanks.

[jsnellbaker]

@jgrimes I'm going to merge this PR at this time. If you need to change the userSync pixels, please submit a new PR.