add 'npm it' command

[isaacs]

I keep wanting a command for npm i && npm t so I could do npm it.

Needs tests and docs, but leaving this here for my fellow CLI peops to weigh in on whether this is a good thing or an excessive thing.

[othiym23]

Aaglaglgalgaglaglahaghaga I want this ALL THE TIME. It might confuse some people's muscle memory, but YES THIS IS A GOOD IDEA:+1::japanese_goblin::ski::sunflower:

[othiym23]

Sounds good, we'll try to get this out next week if you want to put together some tests and docs!

[othiym23]

(and let's go ahead and do this against both 2 and 3)

[zkat]

Missing tests so I'm bumping until next week. Should be quick for me to write some basic ones for this.

[zkat]

Woe is me, if only SOMEONE would be willing to write tests + docs for this ;)

(I can take care of it, but it'll be a bit before I have time)

[iarna]

I'm removing the milestone from this because, at this moment, writing tests for this (which is what's needed to land it) is not scheduled for this week or next.

[mgol]

Sometimes pruning is also needed, would it be worthwhile to have a shortcut for:

npm prune && npm install && npm test

?

[othiym23]

I don't think that's the dominant use case, @mzgol, and I'd like to keep this a simple, focused addition if we can.

[mgol]

OK, fair enough.

[ashleygwilliams]

documentation added.

[iarna]

Tests look good: 🐑

[othiym23]

Rebased against release-3.4.0 and landed as 1ac3e08, bcb04f6, and b6c17dd. This was a real team effort. Thanks, everybody!