Do not strip trailing slash of canonical URLs.
Do not strip trailing slash of canonical URLs.

Usually, links for posts are generated with a trailing slash, but
canonical URLs aren't.  Some services (e.g. http://b.hatena.ne.jp/)
are confused with that behavior.

We can fix it by removing canonical URLs, but then anyone may read
a post with /index.html URL and post the URL to some tool or service.
Therefore rel="canonical" seems useful IMHO.

Signed-off-by: OGINO Masanori <c49462fef669560e618607913e6c283f7627123c@gmail.com>

taz77/docs,jacobmovingfwd/docs,bogdanboss/docs,Zaftula/docs,Ranhiru/docs,L2G/docs,bogdanboss/docs,GilUpstream/docs,ksigler7/docs,L2G/docs,awwa/docs,jacobmovingfwd/docs,awwa/docs,taz77/docs,L2G/docs,L2G/docs,sendgrid/docs,Zaftula/docs,Whatthefoxsays/docs,hardikjain29/docs,awwa/docs,Ranhiru/docs,sendgrid/docs,Whatthefoxsays/docs,Aonepathan/docs,hardikjain29/docs,Aonepathan/docs,katieporter/docs,bogdanboss/docs,hardikjain29/docs,katieporter/docs,jacobmovingfwd/docs,Aonepathan/docs,Whatthefoxsays/docs,taz77/docs,taz77/docs,katieporter/docs,GilUpstream/docs,Zaftula/docs,Ranhiru/docs,awwa/docs,L2G/docs,bogdanboss/docs,Ranhiru/docs,katieporter/docs,Aonepathan/docs,jacobmovingfwd/docs,Ranhiru/docs,jacobmovingfwd/docs,ksigler7/docs,Aonepathan/docs,Zaftula/docs,hardikjain29/docs,taz77/docs,awwa/docs,sendgrid/docs,GilUpstream/docs,Zaftula/docs,GilUpstream/docs,bogdanboss/docs,katieporter/docs,ksigler7/docs,GilUpstream/docs,hardikjain29/docs