Test failing on Windows 10

[mfaheemakhtar]

Tests are failing on my Windows 10 Pro Education 64-bit.

I found that aliases[alias] = nodePath.join(base, aliases[alias]) is adding base path + alias (absolute) path resulting in an invalid location.

Changing join to resolve fixes the issue.
aliases[alias] = nodePath.resolve(base, aliases[alias])

#51 is also affected.

Please note that tests can't run on Windows using yarn run test. The command must be changed from "testonly": "NODE_ENV=test mocha test/specs.js", to "testonly": "SET NODE_ENV=test & mocha test/specs.js", in package.json.