Show relevant sidebar posts on member detail pages

Show relevant sidebar posts on member detail pages

Posts are retrieved and displayed on member detail page sidebars
depending on whether said posts have a tag associated with that
member.

Also added an extra royalsider instance so it can be properly
initialized. This element is hidden, and is an unfortunate
necessity for the posts sidebar slideshow to show up until we get
a chance to find out why it is not being properly initialized.