TreeTDD exercise dhatten#58

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davidhatten wants to merge 6 commits intopaircolumbus:masterfrom

davidhatten:master

Commits on Jan 19, 2018

Tests for tree growing
David Hatten
committed
A healthy apple tree object
David Hatten
committed
added ranges to rand calls
David Hatten
committed
whitespace I guess?
David Hatten
committed
Refactored how apples get added
David Hatten
committed
changing apple diameter to be sensible
David Hatten
committed