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Escape all instances of `"` in `"""` delimited literals

Fixes two bugs associated with `"""` delimited literals.

First: such literals cannot end with a `"` (see `STRING_LITERAL_LONG_QUOTE` at
https://www.w3.org/TR/turtle/#sec-grammar-grammar).

Second: they cannot contain a sequence of three `"`. The prior `.gsub('"""',
'\"""')` approach addresses this for cases where `"` appears in multiples of
three, but fails for other cases (e.g. `""""`).

Both bugs are fixed by escaping all `"` characters.

An alternative addressing only the second bug might be: `.gsub('"""', '\""\"')`,
which would ensure three quotes aren't ever left in a row.

Closes #16.

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