Move mocha to devDependencies to prevent downstream errors

[rosskevin]

Closes #440

[lblackstone]

Hi @rosskevin, thanks for the PR! Can you run make ensure, commit the changes, and resubmit? Note that you'll need the latest version of dep (0.5).

[rosskevin]

@lblackstone ran make ensure locally, no changes to commit. It looks like the travis build became non-responsive.

[lblackstone]

@rosskevin Sorry about the confusion; looks like Travis flaked on the earlier test I looked at. The current failure is because the package.json file is auto-generated from https://github.com/pulumi/pulumi-kubernetes/blob/e4fa04b13a20929c879aca1bbe58fb5a95d16f7c/pkg/gen/nodejs-templates/package.json.mustache

To get this passing, you'll need to update that file to match the changes you made to package.json, and then run make build && make install to rerun the generator code.

[lblackstone]

@rosskevin I'll cut an official release later today, but you should be able to get this change with the pulumi/kubernetes: dev package in about 30 mins. Thanks for the quick turnaround!