knitr 1.0 compatibility

git-svn-id: https://hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/synapter@72557 bc3139a8-67e5-0310-9ffc-ced21a209358
missed on 'asis'

git-svn-id: https://hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/synapter@72558 bc3139a8-67e5-0310-9ffc-ced21a209358
Merge branch 'bioc-devel'