Added watchify dev dep

[fewstera]

When trying to run gulp unittestWatch I got an error for a missing watchify dep. This PR fixes it 👍

[simonbrunel]

That's weird, watchify should not be a dependency anymore and I can't find where it's used in the project. gulp unittestWatch works for me, even after a fresh clone and npm install. What npm version do you use?

[fewstera]

➜ node -v
v4.5.0
➜ npm -v
3.10.6
➜ gulp -v
[13:29:30] CLI version 3.9.0
[13:29:30] Local version 3.9.1

[fewstera]

From the npm blog:

We will also be changing the behavior of peerDependencies in npm@3. We won’t be automatically downloading the peer dependency anymore. Instead, we’ll warn you if the peer dependency isn’t already installed. This requires you to resolve peerDependency conflicts yourself, manually, but in the long run this should make it less likely that you’ll end up in a tricky spot with your packages’ dependencies.

On a fresh install I'm getting:
karma-browserify@5.1.0 requires a peer of watchify@>=3 <4 but none was installed.

So I'm guessing this is where the issue comes from.

https://github.com/nikku/karma-browserify/blob/master/package.json#L60

[simonbrunel]

Nice catch, I'm on npm 2.15.5, that's why it works for me. Can you please amend your commit message to add a more meaningful description, like that we will not delete it again next time the project dependencies are cleaned up :)

[fewstera]

@simonbrunel better commit message added. 👍

[etimberg]

Good to merge