Added changes to exclude logged-in user's activities in common feed + only shared/said/has posted a review on/ can be visible in common feed for the logged-in user+For :has posted a review on: should be excluded in case user follows the vendor already to avoid duplciation of feeds.
Added changes to exclude logged-in user's activities in common feed + only shared/said/has posted a review on/ can be visible in common feed for the logged-in user+For :has posted a review on: should be excluded in case user follows the vendor already to avoid duplciation of feeds.

affan2/django-activity-stream,affan2/django-activity-stream