Squashed commit of the following:

commit a5fb47f4800f49756a8a78aace3bd40de6283b0f
Author: Boone B Gorges <boonebgorges@gmail.com>
Date:   Mon Jul 14 09:18:26 2014 -0400

    Don't call blog activity function if 'blogs' or 'activity' is deactivated

    Fixes #30

git-svn-id: https://plugins.svn.wordpress.org/bp-groupblog/trunk@948084 b8457f37-d9ea-0310-8a92-e5e31aec5664
1.8.7 update

git-svn-id: https://plugins.svn.wordpress.org/bp-groupblog/trunk@948086 b8457f37-d9ea-0310-8a92-e5e31aec5664