Merge pull request #88 from Yoast/license_tab

Added license page for extensions
Activation check
Merge branch 'master' of https://github.com/Yoast/google-analytics-for-wordpress

Conflicts:
	admin/pages/extensions.php
Button to activate becomes orange
Test cases for class-frontend
Best user roles checking in admin class
Merge branch 'master' into license_tab

Conflicts:
	admin/pages/extensions.php