Add support for multiple delimiters

[willm]

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[willm]

Addresses #1054

[juanri0s]

@willm looks like CI tests are failing. Mind reviewing them? The suite was having issues before so it probably wasn't caught when you opened the PR.

[willm]

@juanri0s The issue #102 test was flaky due to not always completing in jest's default 5 second timeout, I increased the test timeout to 7 seconds. I hope this is acceptable, I'm pretty sure this was intermittently failing before my changes.