Install using Yarn vs. NPM 4x faster

[DenisCarriere]

Using Yarn 4x faster

There are many benefits of using Yarn, mainly it is a fast & secure way to install dependencies from package.json.

Below are install times comparing npm install vs. yarn using TurfJS.

Also including yarn.lock can speed up the install process by 1.5-2x.

TravisCI can using Yarn by default if yarn.lock is available.
https://blog.travis-ci.com/2016-11-21-travis-ci-now-supports-yarn

Single Package /packages/<module>

NPM (install 10.9s)

npm install  4.28s user 1.43s system 52% cpu 10.921 total

Yarn (install 2.3s - 4.7x faster than npm)

with yarn.lock(2x faster with lock)

yarn  1.89s user 1.01s system 120% cpu 2.396 total

without yarn.lock

yarn  2.61s user 1.29s system 77% cpu 5.026 total

TurfJS repo /

NPM (install 2m12s)

npm install  52.40s user 17.35s system 52% cpu 2:12.66 total

Yarn (install 30s - x4.4 faster)

with `yarn.lock (1.5 faster with lock)

yarn  26.88s user 10.01s system 122% cpu 30.220 total

without yarn.lock

yarn  33.01s user 12.04s system 102% cpu 43.828 total

[DenisCarriere]

Add via #766