Bids-validator

- error for empty files (https://github.com/bids-standard/bids-validator/pull/645, https://github.com/bids-standard/bids-validator/pull/649, https://github.com/bids-standard/bids-validator/pull/656)
- updating iEEG validation (https://github.com/bids-standard/bids-validator/pull/591)
- remote files validation (https://github.com/bids-standard/bids-validator/pull/640)
- better error message for missing participants (https://github.com/bids-standard/bids-validator/pull/644)
- added special error for missing sessions (https://github.com/bids-standard/bids-validator/pull/639)
- catch exceptions as issues (https://github.com/bids-standard/bids-validator/pull/638)

- Check if `IntendedFor` indeed points to nifti files (https://github.com/bids-standard/bids-validator/pull/634)

- Fix missing trims (https://github.com/bids-standard/bids-validator/pull/631)

* Workaround issues with npm -g for release builds (609)

* Fix for...in regression when paired with [Papaya](https://github.com/rii-mango/Papaya) (#596)