Add shortcode to query BuddyPress members

A client of ours wanted to use your plugin for their site, but we needed the ability to query BuddyPress members.  I have added that ability and the ability to query by BP Group, BP Xprofile Field, and left any compatible options from the WP_User_Query.  I have also added the ability to display any Xprofile Field as well as keeping the user data in the regular user shortcode.