Make bin/jest.js point directly at CWD-local "jest" bin (rather than node_modules/.bin/jest)

npm on windows doesn't use some form of symlinks like on *nix, but instead uses
wrapper batch files of some kind. As such, it's unreliable to assume
that node_modules/.bin/jest is a JS module.

This changes bin/jest.js to, instead, try to directly require the binary
path.

Author: jeffmo

bin/jest.js

@@ -310,18 +310,19 @@ function _main() {
     cwdPackageRoot = path.resolve(cwdPackageRoot, '..');
   }
 
+  // Is there a package.json at our cwdPackageRoot that indicates that there
+  // should be a version of Jest installed?
+  var cwdPkgJsonPath = path.join(cwdPackageRoot, 'package.json');
+
   // Is there a version of Jest installed at our cwdPackageRoot?
   var cwdJestBinPath = path.join(
     cwdPackageRoot,
     'node_modules',
-    '.bin',
-    'jest'
+    'jest-cli',
+    'bin',
+    'jest.js'
   );
 
-  // Is there a package.json at our cwdPackageRoot that indicates that there
-  // should be a version of Jest installed?
-  var cwdPkgJsonPath = path.join(cwdPackageRoot, 'package.json');
-
   // If a version of Jest was found installed in the CWD package, run using that
   if (fs.existsSync(cwdJestBinPath)) {
     var jestBinary = require(cwdJestBinPath);