Draft examples for BEP032 on animal electrophysiology

[robertoostenveld]

This supersedes and closes #429.

This bep032 serves to collect and compare all examples. Examples for BEP032 can be added to this branch by making a pull request from your personal repository. Individual examples do not need a thorough review for merging with this bep032 branch, but the complete bep032 branch will be thoroughly reviewed upon merging with master, which is scheduled to happen around the time that BEP32 is finalized and the validator is updated.

For reference, BEP32 is discussed in this google doc and in this pull request to bids-specification.