Handle multiline comment in metadata

Hi!

We have a multiline leading comment in some of our templates, and they failed as the plugin tried to read it as metadata.

I haven't got the time at work to fight with the proxy in order to clone the repo, so I haven't been able to add  tests for this (used the website to edit the file).
If this is something your'e interested in merging, I'll do it properly with tests from home later. :smile: