Add DistroScale Bid Adapter

[duancg]

Type of change

• New bidder adapter

Description of change

Adding a new DistroScale Bid Adapter.

• test parameters for validating bids

[{
    code: 'div-gpt-ad-1460505748561-0',
    mediaTypes: {
        banner: {
            sizes: [[300, 250]],
        }
    },
    bids: [{
        bidder: 'distroscale',
        params: {
            pubid: '12345',
            zoneid: '67890'
        }
    }]
}]

Be sure to test the integration with your adserver using the Hello World sample page.

• contact email of the adapter’s maintainer: prebid@distroscale.com
• official adapter submission

For any changes that affect user-facing APIs or example code documented on http://prebid.org, please provide:
This change does not change any API nor documentation other than the one dedicated to DistroScale Bid Adapter.

• A link to a PR on the docs repo at https://github.com/prebid/prebid.github.io/
  Add DistroScale Bid Adapter prebid.github.io#3665

Other information

[lgtm-com]

This pull request introduces 1 alert when merging 0136296 into 64bd041 - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class

[ncolletti]

hey @duancg -- looks like your test fails with linting errors, could those be resolved?

[duancg]

Hi @ncolletti , thanks for pointing it out, we linted the code and now it should pass all tests. and Here is the latest commit 61f768b . Should I file a new pull request or this request should suffice?

[ncolletti]

@duancg The adapter looks great, nice work. Only thing I noticed is duplicate data being sent in your bid requests between tagid and zoneid, however, I presume that is intentional?

[duancg]

@duancg The adapter looks great, nice work. Only thing I noticed is duplicate data being sent in your bid requests between tagid and zoneid, however, I presume that is intentional?

Thanks for your comment! Yes, the information is replicated intentionally in two places for compatibility with some backend servers.