Added support for tags

app/model/tag.js

@@ -0,0 +1,11 @@
+var mongoose = require('mongoose'),
+	Schema = mongoose.Schema,
+	ObjectId = Schema.ObjectId;
+
+var tagSchema = new Schema({
+	_id: String,
+	client: { type: ObjectId, ref: 'Client' },
+	data: {}
+}, { versionKey: false })
+
+var Tag = module.exports = mongoose.model('Tag', tagSchema);