WIP: Start on Project.prototype.scan

Right now it calls out to grep and parses the output, but doesn't do anything with it just yet.

src/stdlib/child-process.coffee

@@ -14,6 +14,7 @@ class ChildProccess
       options.stderr = @bufferLines(options.stderr) if options.stderr
 
     $native.exec command, options, (exitStatus, stdout, stderr) ->
+      console.log exitStatus
       if exitStatus != 0
         error = new Error("Exec failed (#{exitStatus}) command '#{command}'")
         error.exitStatus = exitStatus