Switch Link and Path to characteristic to get sane comparison and hashing behavior.
Add Path.eachSubPath.
Link to github issues instead.
Get rid of this other obviously broken link as well.
Merge pull request #58 from exarkun/issue-tracker-link-57

Fix README links
Merge pull request #56 from exarkun/eachsubpath

Add Path.eachSubPath
Merge remote-tracking branch 'origin/master' into containment-is-broken