Refactor status codes.

src/core/status-codes.js

@@ -0,0 +1,21 @@
+/**
+Status codes for HackMyResume.
+@module status-codes.js
+*/
+
+(function(){
+
+  module.exports = {
+    success: 0,
+    themeNotFound: 1,
+    copyCss: 2,
+    resumeNotFound: 3,
+    missingCommand: 4,
+    invalidCommand: 5,
+    resumeNotFoundAlt: 6,
+    inputOutputParity: 7,
+    createNameMissing: 8,
+    wkhtmltopdf: 9
+  };
+
+}());