deps: upgrade npm to 2.7.3

[othiym23]

Since I'm now an io.js collaborator, I'm happy to merge this myself. However, I still need sign-off from one or more other collaborators, so give this a look if you have a few minutes.

This is another bug release, and this is actually a roll-up of two versions, because an interim release was made to the canary release to fix a nasty regression that had crept in:

• 1549106
  #7641 Due to 448efd0, running npm shrinkwrap --dev caused production dependencies to no longer be included in
  npm-shrinkwrap.json. Whoopsie! (@othiym23)

Aside from that, here are the two most important fixes from 2.7.2:

• fb0ac26
  #7579 Only block removing files and
  links when we're sure npm isn't responsible for them. This change is hard to
  summarize, because if things are working correctly you should never see it,
  but if you want more context, just go read the commit
  message,
  which lays it all out. (@othiym23)
• 051c473
  #7552 bundledDependencies are now
  properly included in the installation context. This is another fantastically
  hard-to-summarize bug, and once again, I encourage you to read the commit
  message
  if you're curious about the details. The snappy takeaway is that this
  unbreaks many use cases for ember-cli. (@othiym23)

There are, as usual, a few other smaller fixes in the release as well. I've applied the floating patch for node-gyp yet again, and would very much like to not have to do this for too many more releases. Please?

R=@rvagg
R=@Fishrock123

[rvagg]

LGTM

I know of at least one large company that's shipping off npm shrinkwrap --dev files to nsp, so they might appreciate getting prod deps in there!

And ,, what's going on with your AUTHORS file?

[kenany]

@rvagg We discovered just as you did that awk on OS X is bad at keeping the sort order. Now we use perl npm/npm#7597 :)

[Fishrock123]

@othiym23 Can you make sure to use --whitespace=fix when merging? There's some whitespace errors that always crop up in these. :)

deps/npm/node_modules/npm-registry-client/test/fixtures/underscore/1.3.3/package.tgz

ehhh

make test-npm is happy. Reviewed code. LGTM otherwise.

Edit: Also make test-npm leaves a bunch of garbage lying around after, not sure if that is on our end or npm's end?

[rvagg]

@othiym23 if you land this within the next couple of hours we can include it in 1.6.2.

[Fishrock123]

If @othiym23 isn't around, I move we just land it as we normally have.

[bricss]

npm v2.7.4 already arrived.

[kenany]

@bricss But it's a pre-release so don't bring that up until next Thursday :) https://github.com/npm/npm/wiki/Release-Process

[othiym23]

Landed in b542fb9 with the rollup node-gyp patch in 269e46b. Thanks to everyone for their review and helping me figure out how to get this landed!