Add Enhanced Link Attribution to SiteAnalyticsModule

Controlled bythe new google_enhanced_link_attribution ini setting, which is defaulted to true since we want this on all our sites by default.

See https://support.google.com/analytics/answer/2558867?hl=en&ref_topic=2558810 for further details.
coding standard cleanup
Make inpage link id plugin load on SSL.
Merge pull request #1 from gauthierm/10693-enhanced-link-attribution

Make inpage link id plugin load on SSL.
better comments
remove unnecessary che

we already have checked to make sure it is an array, and since we do a foreach of the content this isn't needed at all
use single quoted strings.
Merge pull request #13 from isaacgrant/10693-enhanced-link-attribution

Enhanced link attribution