Add old comments to #install
Re-refactor lockfile to use a hash instead of an array for O(1) lookups
Fix failing install feature
Fix failing update features
Write the correct hash from the CookbookSource
Fix failing update feature
Use a hash instead of an array for sources
Refactor berksfile to use new lockfile and simplified methods
Use new #resolve in Cli
Fix broken show feature
Fix broken update feature
Fix failing unit specs