Exclude examples and test from npm package

[wojteo]

Could examples and test directories be excluded from the npm package? I doubt they are needed by developers when using this library, and examples may require manual removal if library is used in commercial project.

treeify/examples/eukaryotes.js

Lines 3 to 4 in 3855e5d

	// Based on information taken from the Tree of Life web project
	// http://tolweb.org/Eukaryotes/3

I didn't research licensing in-depth, but at a glance it may be problematic as it mentions:

The TEXT of this page is licensed under the Creative Commons Attribution-NonCommercial License - Version 3.0
For the general terms and conditions of ToL material reuse and redistribution, please see the Tree of Life Copyright Policies.