ADEN-28 Amazon Direct Targeted Buy

All besides 0b0c519 is production ready. The 0b0c519 is for testing purposes only (may be reverted later).

We may need to tweak conditions under which the script is appended, right now is only per wg variable ($wgEnableAmazonDirectTargetedBuy).

Please don't merge, just move the issue in JIRA (let QA merge code when they say it's working).