Adding adsense tracking
Merge branch 'master' of github.com:Yoast/google-analytics-for-wordpress into adsense_tracking
Merge pull request #101 from Yoast/adsense_tracking

Adsense tracking - [Finishes #78628120]
Notice bugfix for Adsense
Some more notice fixes in the settings
Options check function build in to prevent more notices
Test fix for new options
Test the options check function
Test the custom code with escaped slashes
Codestyle fix
Test for the do_tracking