fix(tests): replace intermittently failing to rebuild newrelic module with cld

[malept]

Have you read the section in CONTRIBUTING.md about pull requests?

Yes

Are your changes appropriately documented?

N/A

Do your changes have sufficient test coverage?

Yes

Does the testsuite pass successfully on your local machine?

Yes

Summarize your changes:

• replace the newrelic module with one that hopefully rebuilds more consistently on Windows (and also has a better license)
• DRY up the rebuild tests

[malept]

Hmmm. I think it's less to do with the module itself and perhaps more to do with Windows + Node async? (For reference, it passed the first AppVeyor PR build, then I re-ran it to be more confident that it wasn't a fluke.)

gyp ERR! build error 
gyp ERR! stack Error: EBUSY: resource busy or locked, open 'C:\Users\appveyor\.electron-gyp\.node-gyp\iojs-1.4.12\Release\iojs.lib'
gyp ERR! stack     at Error (native)

(iojs?!)

[MarshallOfSound]

@malept Maybe on windows due to resource locking we have to rebuild sequentially?

[malept]

@MarshallOfSound

Maybe on windows due to resource locking we have to rebuild sequentially?

That's pretty likely. electron-rebuild doesn't run into this?

[MarshallOfSound]

@malept This will be handled by the default sequential / parallel behavior of my electron-rebuild port / branch.

https://github.com/electron/electron-rebuild/tree/new-rebuild

[malept]

Obsoleted by #70.