another README tweak
bringing back some old behavior
don't have to non-zero exit here
better null return
Revert "don't find replacements for labels either"

This reverts commit ed8258a5c4f50ae4ee9ca485afc134322d5f39ef.
Revert "bringing back some old behavior"

This reverts commit cea166afb69ea68eea9fc118b4f6861aae9e9c18.
Merge branch 'master' into gh-pages