adsense 7.x-1.7

Releases 1.4 to 1.6 were removed while working on the broken responsive ad support.

Changes since 7.x-1.3:

• Fix responsive ad support following #2317875.
• #2563101 by fenstrat: Support page-level ads
• Embedded results page is no longer supported in old search.
• #2317875: Support custom ad sizes for managed ads.
• #2405631: fix passed by reference warning on revenue sharing.
• #2410101: remove ability to choose responsive format for old code ads, as they require the new async script.
• Code cleanup.
• Remove no-longer working google_adtest option.
• #2319547 by czigor: remove undefined shape warning.
• Restore watermark in custom search.
• Add support for new ad sizes.
• #2452057: remove section targeting, as it is obsolete.