Connect first and last points of a outline using modulo #370
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Test cases renders as:

Cause of issue:
Needed to preform modulo when generating outline, without it the first and last coordinate pairs in a coordinates element didn't behave appropriately. Coordinates for a polygon are better thought of as a circular linked list rather than a sequence with a start and an end.
On a side node, the behavior of
%
operator in JavaScript is not consistent at all, occasionally -1 % 4 = 3 and other times -1 % 4 = -1, there's a work around in this PR for it but it's odd nonetheless.Closes #368