Dev UX tweaks

[pimterry]

Some independent dev process tweaks, extracted separately from the rest of my changes. These mean that now:

• Versionbot will autodeploy to npm
• npm run build builds, but doesn't run the tests (while npm test builds then runs the tests) - this is useful for upcoming node-gyp additions - EDIT: I've now actually just removed Gulp entirely, since plain npm scripts actually makes this process (and future changes) quite a bit simpler
• npm install doesn't run the full test suite - only npm publish does

[hedss]

"Versionbot will autodeploy to npm" - \o/

Looks fantastic to me. Removing gulp is def. a good call.

At some point, we'll need to move this over to Circle, but given there are still potential issues with secrets, I'm in no rush.

Thanks for this!

[resin-io-modules-versionbot]

VersionBot failed to carry out a status check for the above pull request here: #34. The reason for this is:
Reference already exists
Please carry out relevant changes or alert an appropriate admin.