(TK-83) Add :enable-trailing-slash-redirect option

Add new :enable-trailing-slash-redirect option to the options map
for all service functions that add handlers. When true, all
requests made to the handler without a trailing slash will be
redirected to have a trailing slash. Defaults to false.
Does this mean the default would be to do the redirect (backward compatible behavior)?  Was thinking @cprice404 and @KevinCorcoran had overruled me and said they wanted the new default to be "false"...