Improved documentation in Members component. See #5022

git-svn-id: https://buddypress.svn.wordpress.org/trunk@8318 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Improve inline documentation in Members component. See #5022.

git-svn-id: https://buddypress.svn.wordpress.org/trunk@8319 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Update bp_last_activity cache when fetching user last_activity.

The cache doesn't do much when it's not set :)

git-svn-id: https://buddypress.svn.wordpress.org/trunk@8320 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Fix incorrect variable reference in last_activity test

git-svn-id: https://buddypress.svn.wordpress.org/trunk@8321 cdf35c40-ae34-48e0-9cc9-0c9da1808c22