Add the github-linguist package

This commit only adds a single package and all of its transitive
dependencies. The github-linguist package will be used for counting
lines of code as a baseline for databases we are analyzing.

node_modules/language-map/test.js

@@ -0,0 +1,11 @@
+var map    = require('./');
+var assert = require('assert');
+
+describe('language map', function () {
+  describe('module', function () {
+    it('should export an object with languages as the keys', function () {
+      assert.ok(map['Python'].extensions.indexOf('.py') > -1);
+      assert.ok(map['JavaScript'].extensions.indexOf('.js') > -1);
+    });
+  });
+});