sweeping updates

Removed all dead (more than one year since last update) links,
alphabetized lists, added accurate htmlUrl links, added dateModified,
de-duped list.
Removed all feeds that haven't been updated in more than a year.
Alphabetized and de-duped all lists. Updated htmlUrls with appropriate
URLs.
Merge pull request #1 from dalejcruse/gh-pages

sweeping updates