camelCased helper file names not working

**Sails version**:1.1.0
**Node version**:8.12.0
**NPM version**:6.2.0
**DB adapter name**: sails-mongo
**DB adapter version**: 1.0.1
**Operating system**:Windows 10

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I created a helper `cleanUserData.js` inside the /api/helpers/ folder but it throws an error - `cleanUserData is not a function` when i try to use the helper function in my UserController.js
I changed the file name to be all lowercased - `cleanuserdata.js` and also changed the name in my `UserController.js` - where i was using it to be all lowercased and it works.

I've tried the same thing with other helpers i created subsequently but camelCased helper file names just don't work

Reproduce the failure with /api/helpers/cleanUserData.js and its use in UserController.js, then compare it with the working all-lowercase filename. Trace how Sails discovers and exposes helper files, and verify that a camelCased helper can be called successfully without renaming it.

Written by the indexing model from the issue text.