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[#71] Implement custom accessors (#72)

* [#71] Added ability to attach custom accessors.

* [#71] Added ability to attach custom accessors.

* [#71] Document that accessors are instance-specific.

* [#71] Document that accessors are instance-specific.

* Address PR comments.

- Drop support for Node 6 & 7 (no longer LTS).
- Address some issues causing code coverage drop.

* [#71] Updated documentation.

* [#71] Tightened up documentation a teeny bit 🔧

* [#74] Remove `raiseError` accessor param.

If an accessor cannot process an input value, it should just throw an exception instead.

There is a trade-off to this approach, in that the stacktrace for the accessor-thrown error is not preserved (replaced by `_raiseError()`), but accessors tend to be fairly simple in implementation, so it shouldn' be too difficult to locate the source of an error.

* [#71] Replace `addAccessor` w/ extra param for `from`.

* [#71] Updated documentation.

* [#74] Refactored now-unnecessarily-complex function 🍃

* [#71] Add compat for #74.

* [#71] Removed obsolete link ⛓

* [#71] Fixed incorrect `@param` for `extraAccessors` 🤖

* [#71] Fixed obsolete documentation 🚂

* Bifurcating rabbits.

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