Added event metadata to member frontend requests
Added event metadata to member frontend requests

refs https://github.com/TryGhost/Team/issues/1061

Member activity is a labs alpha feature which aims at capturing member events for site owner if switched on. The event metadata captures the site page/post where the event originates from, and the post/page id is included as content of new ghost analytics meta tag.

This change passes the event metadata to member frontend requests which allows server to capture event information for member actions when the analytics is switched on.

TryGhost/Ghost,TryGhost/Ghost,TryGhost/Ghost