fix: run node-gyp rebuild correctly

[malept]

It should have iterated through all of the node-gyp commands since node-gyp rebuild pushes clean, configure, and build commands to the todo list. Also:

• ensures that the module path is the current working directory when it's running
• adds a regression test

Fixes #404

[malept]

A further complication: node-gyp likes to set the MSVS version (and corresponding environment variable) to 2015, which is very problematic on the CIrcleCI Windows machines. Had to cache the original value when instantiating the Rebuilder class and also restore the environment variable after each call to rebuild() in tests.

[malept]

@electron/wg-ecosystem this is ready for review. Sorry for the commit noise earlier, I had to figure out the Windows situation.

One person reports that this PR is working for them: #404 (comment)

[electron-bot]

🎉 This PR is included in version 2.0.3 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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