Bug#933841: pkg-js-tools should install "main" field in addition to "files" section of package.json

[Pirate Praveen]

Package: pkg-js-tools
version: 0.8.9
severity: important
Example package where this fails: node-schema-utils.

ajv-keywords embedded in this package has both "main" and "files" field, 
but only "filed" field got installed.