Make <link rel="up"> call multi_tag_path
Make <link rel="up"> call multi_tag_path

Tested-by: Mark Somerville <f1b5a91d4d6ad523f2610114591c007e75d15084@crocodile.is> [MRI 2.1.5, Chromium 39]
Signed-off-by: Mark Somerville <f1b5a91d4d6ad523f2610114591c007e75d15084@crocodile.is>

Spakman/isoworks,Spakman/isoworks