Small template refinements

[ghost]

• Authors are separated by comma only if there are more than one
• Tags are wrapped (before they would overlap the summary text)

[jjangsangy]

I'm fine with these changes, but can you remove the need to add lxml in the requirements.txt. It looks like it is breaking the build with travis.

I'm looking into refactoring Goose so we don't have to deal with this mess in the future.

[ghost]

Done