Currently the node.js action running for zip files requires either an index.js or package.json with a main entry module declared. I propose expanding the support for specifying "main" (e.g., wsk action create --main module.function) so that one can override the module to be loaded too.
This will require a change to the `runner` module. Soliciting feedback here https://github.com/apache/incubator-openwhisk-runtime-nodejs/issues/131. Thanks. -r
