Require Vim 7.
Navigate to Node modules with "gf".
Attempt to open path with a suffix appended.
Try all suffixes for index file, too.
Consider "../" also as a relative path.
Resolve directory to path via package.json.
Handle "main" as directory in package.json.
Add ".json" to "suffixesadd".
Update README and CHANGELOG.
Merge branch 'features/gotofile'