fix aliasing when running inside jest

[pigoz]

I am not sure why this causes problems when running the loader through jest and not webpack but this simple fix seems to fix my issues. Following is the the commit message.

It looks like when running the loader from jest, process.env looks up
the env property on the process function instead of the global object.
This results in errors like the following:

 FAIL  test/jest_test.re
  ● Test suite failed to run

    TypeError: process.cwd is not a function

      at Function.process (node_modules/bs-loader/index.js:108:13)
          at Generator.next (<anonymous>)

I renamed the process function to something else to remove this name
aliasing issue.

[rrdelaney]

Hey @pigoz! Thanks so much for the PR! It makes sense, there’s the global “process” object too - might be interfering in some places. We don’t have any tests for Jest, so thanks for catching this and fixing it!