Update sqlite addColumn function to handle enums.

lib/dialects/sqlite/query-generator.js

@@ -155,8 +155,24 @@ module.exports = (function() {
       return query;
     },
 
-    addColumnQuery: function() {
-      var sql = MySqlQueryGenerator.addColumnQuery.apply(this, arguments);
+    addColumnQuery: function(table, key, dataType) {
+      var query = 'ALTER TABLE <%= table %> ADD <%= attribute %>;'
+        , attributes = {};
+
+      attributes[key] = dataType;
+      var fields = this.attributesToSQL(attributes, {
+        context: 'addColumn'
+      });
+      var attribute = Utils._.template('<%= key %> <%= definition %>')({
+          key: this.quoteIdentifier(key),
+          definition: fields[key]
+        });
+
+      var sql =  Utils._.template(query)({
+        table: this.quoteTable(table),
+        attribute: attribute
+      });
+
       return this.replaceBooleanDefaults(sql);
     },