changes with more filtering functionality
changes with more filtering functionality

findMentions:

1. changed kwarg domains to exclude_domains 
2. option to give html content directly through 'content' kwarg.
3. option to give a filter for the html fragment to scan. removed scanning for 'reply'.
4. refs in result is now a set of mentioned urls.

findEndpoint: minor change to list of links to conform to other functions
bear/ronkyuu,bear/ronkyuu