Add partial to display metadata record content

I am not sure whether this is a good idea, due to different places where
the content has to be looked up, but I have added a partial to display
relevant record content.

Signed-off-by: Konrad Reiche <konrad.reiche@gmail.com>
Silence Mongoid logger

The Mongoid logger starts to become a pain. The level debug is really
not necessary, hence I have set it up to info.

Signed-off-by: Konrad Reiche <konrad.reiche@gmail.com>
Debugging the link checker metric

A lot of problems with the link checker metric which I have not
understood yet properly. Just some changes incoming.

Signed-off-by: Konrad Reiche <konrad.reiche@gmail.com>