Minor fix.
Add dev/update_authors.sh script
Update crawler.
crawler.py: Add option to ignore hashtag in link.
Allow pager infrastructure to switch between sources.
index.db: now includes index from cppreference.com
Fix table reference.
flake8 all python sources.
Fix listdir exception.
Fix tests.
Fix typo
Improve formatter
Fix tableparser.
move formatter into formatter sub package.
Add cppreference.com formatter.
config migration: allow fallback to default value.
Fix constructer replacement.
Fix test.
Merge branch 'dev'

Implment cppreference.com backend, close #24