Fix setting NODE_PATH in specs window.

spec/spec-suite.coffee

@@ -26,6 +26,13 @@ setSpecDirectory = (specDirectory) ->
 
 runAllSpecs = ->
   {resourcePath} = atom.getLoadSettings()
+
+  # Add 'src/exports' to module search path.
+  exportsPath = path.resolve(resourcePath, 'exports')
+  require('module').globalPaths.push(exportsPath)
+  # Still set NODE_PATH since tasks may need it.
+  process.env.NODE_PATH = exportsPath
+
   # Only run core specs when resource path is the Atom repository
   if Git.exists(resourcePath)
     requireSpecs(path.join(resourcePath, 'spec'))