[wraithgar]

Adds an example, and a note about how this differs than node's default
behavior

References

Closes npm/statusboard#247

[npm-deploy-user]

	angular-quickstart			app-large			app-medium			ember-quickstart			react-app
	prev	current	status	prev	current	status	prev	current	status	prev	current	status	prev	current	status
initial install	41s	42s	✅🐌	39.5s	43.4s	✅🐌	34.5s	31.7s	✅	28.1s	26.1s	✅	33.5s	36.1s	✅🐌
repeat install	9.6s	2.9s	✅	8.6s	3.5s	✅	8.3s	2.4s	✅	7.7s	1.9s	✅	9.1s	2.6s	✅
with warm cache	32.3s	23.7s	✅	33.8s	28.6s	✅	31.3s	20.3s	✅	23.4s	16.5s	✅	29.1s	18.2s	✅
with node_modules	9.2s	5.4s	✅	8.6s	4.7s	✅	9s	3.3s	✅	7.8s	1.8s	✅	9.4s	5.8s	✅
with lockfile	32.6s	28.2s	✅	31s	28.6s	✅	29s	22.8s	✅	21.7s	17.1s	✅	27.4s	25.2s	✅
with warm cache and node_modules	9.3s	3.5s	✅	7.9s	3.7s	✅	8.4s	2.9s	✅	7.6s	1.9s	✅	9.2s	3s	✅
with warm cache and lockfile	24.7s	10s	✅	26.3s	13.3s	✅	24.3s	8.3s	✅	17.8s	6.7s	✅	21.3s	8s	✅
with node_modules and lockfile	10.1s	5.3s	✅	9.8s	4.2s	✅	8.6s	3s	✅	7.8s	1.7s	✅	9.7s	5.6s	✅