Fixed breadcrumb links in site templates.
Fixed breadcrumb links in site templates.

This patch makes sure that we do not leak newlines into breadcrumb
links created from page titles, and fixes the handling of spaces which
are represented with dashes.

Review: https://reviews.apache.org/r/67903/

jpeach/mesos,chhsia0/mesos,kaysoky/mesos,reneploetz/mesos,gsantovena/mesos,abudnik/mesos,reneploetz/mesos,abudnik/mesos,abudnik/mesos,dforsyth/mesos,abudnik/mesos,andschwa/mesos,andschwa/mesos,andschwa/mesos,abudnik/mesos,reneploetz/mesos,andschwa/mesos,chhsia0/mesos,jpeach/mesos,jpeach/mesos,dforsyth/mesos,Gilbert88/mesos,jpeach/mesos,reneploetz/mesos,abudnik/mesos,gsantovena/mesos,gsantovena/mesos,andschwa/mesos,Gilbert88/mesos,kaysoky/mesos,Gilbert88/mesos,gsantovena/mesos,jpeach/mesos,dforsyth/mesos,jpeach/mesos,reneploetz/mesos,Gilbert88/mesos,reneploetz/mesos,dforsyth/mesos,chhsia0/mesos,kaysoky/mesos,abudnik/mesos,Gilbert88/mesos,kaysoky/mesos,Gilbert88/mesos,chhsia0/mesos,andschwa/mesos,kaysoky/mesos,kaysoky/mesos,dforsyth/mesos,kaysoky/mesos,chhsia0/mesos,Gilbert88/mesos,gsantovena/mesos,dforsyth/mesos,chhsia0/mesos,gsantovena/mesos,andschwa/mesos,jpeach/mesos,gsantovena/mesos,chhsia0/mesos,dforsyth/mesos,reneploetz/mesos