Do not capitalize collection-title with a journal.

This prevents the capitalization of ‘5th ser.’ or ’n.s.’.
Fix indentation.
Fix indentation.
Escaped em-dashes.
Escaped em-dashes.
Change comma/space prefix to group delimiter.
Fixed em dash again.
Merge pull request #884 from adunning/master

Do not capitalize collection-title with a journal in MHRA.