Revert "Update fcr:fixity to produce asynchronous responses"

This reverts commit 25f6722e154a183d7c2826e095291b6dd5744fec.
Merge pull request #662 from mikedurbin/revert-async-fixity

Revert "Update fcr:fixity to produce asynchronous responses"
Disallowed import when import root node is jcr:content.
Disallow JCR/XML serialization of binary and NonRDFResourceDescription nodes.
Fixed a bug in tombstones from MOVE operations.
Addressed review comments.