Revert "Merge pull request #115 from llasram/reducible-body"

This reverts commit ce4ea262071b8fae7c5e04948b08663ed8303efd, reversing
changes made to bf7e61550ae303b3a0a6448c0aa3e321afb19677.

Checking whether an object satisfies the CollReduce protocol is not
sufficient to determine whether the object is reducible.
Updated Hiccup to 1.0.5 in ring-devel