Add data makefile

data/make.js

@@ -0,0 +1,16 @@
+var fs = require('fs');
+
+function r(f) { return JSON.parse(fs.readFileSync(__dirname + '/' + f)); }
+function rp(f) { return r('presets/' + f); }
+
+fs.writeFileSync('data.js', 'iD.data = ' + JSON.stringify({
+    deprecated: r('deprecated.json'),
+    discarded: r('discarded.json'),
+    keys: r('keys.json'),
+    presets: {
+        presets: rp('presets.json'),
+        defaults: rp('defaults.json'),
+        categories: rp('categories.json'),
+        forms: rp('forms.json')
+    }
+}));