Specifying both --html and --fragment outputs just the fragment

[nabijaczleweli]

Consider:

nabijaczleweli@tarta:~/code/klapki/man$ ls
index.txt  klapki.md
nabijaczleweli@tarta:~/code/klapki/man$ ronn -f5 klapki.md
html_fragment: ./klapki.8.html_fragment
nabijaczleweli@tarta:~/code/klapki/man$ ls
index.txt  klapki.8.html_fragment  klapki.md

[apjanke]

Had to revert the change in https://github.com/apjanke/ronn-ng/commit/4bbb05a27c3e94060c7a432dae06a57e10066c21 because it broke the test suite. Re-opening this bug and rescheduling it for 0.11.0 or later.