Fix Comments unmarshalling

[ifosch]

This fixes #23
I know this is not the most desired way of accessing Comments, since it requires to duplicate reference to Comments. I'm looking in a better way of doing this, but being a slice, it doesn't work.
I might like to find a better way of doing this, so help here would be appreciated.

[coveralls]

Coverage remained the same at 80.115% when pulling f7ea942 on ifosch:comments into 6c73f2f on andygrunwald:master.

[andygrunwald]

Thank you