Include changelog in site.
Added spec changelog
Added version 0.13 of spec
Revert "Added version 0.12 of spec"

This reverts commit 86f659a30efacac973aa02a9977a765d1bd3a20a.
Makefile - use -q with grep.
Makefile - ensure that all changes are committed.
make_site_index.sh - don't use absolute paths.
Added version 0.13 of spec