Prebid 0.27.1

🛠 Maintenance

• xhb adapter now makes use of the bid sizes #1513
• Sharethrough adapter: check if tagJS is already present #1500
• use utils.getTopWindowUrl() to get top window URL for indexexchange a… #1507
• Updated karma-mocha and simplified the test framework for non --watch runs #1520

🐛 Bug Fixes

• removing for...of loops because IE cannot handle them properly #1523
• AppNexus adapter won't override AdUnit params for native assets #1524
• Revert "drop specific code for index adapter (#1487)" #1529
• utils.getTopWindowLocation() returns exception object #1530