Define Source#inspect (otherwise it prints the entire universe)
Refactor `berks outdated` to pick the highest version
Update human formatter to use new Berksfile#outdated hash
Update JSON formatter to use new Berksfile#outdated hash
Define Source#hash to be the URI's host to prevent duplicates
Fix failing cucumber tests
Only use a single API source for outdated
Prefer sources in order
Merge pull request #1142 from berkshelf/sethvargo/fix_outdated

Fix outdated checks