Reroute Author controller using Chained actions
Get author feed data directly instead of forwarding

By changing the Author controller to chained actions I broke the
forwarding to /author/index but it was also doing more requests than necessary.
Fix uc-author redirect on feed

Because the feed forwarded to /author it used to redirect,
but to the wrong Location.  I had to change the chained actions to switch
from Path to PathPart in order to get `$c->action` to be right.
Remove unused condvar