Fix failing tests for single quotes in strings.

Make everything use the same method for escaping. It was couple of
inline `.replace` calls before (in base and mysql drivers).

Author: szymonrw

lib/driver/base.js

@@ -174,7 +174,7 @@ module.exports = Base = Class.extend({
       columnNames += columnNameArray[index];
 
       if (typeof(valueArray[index]) === 'string') {
-        values += "'" + valueArray[index].replace("'", "''") + "'";
+        values += "'" + this.escape(valueArray[index]) + "'";
       } else {
         values += valueArray[index];
       }
@@ -226,6 +226,6 @@ module.exports = Base = Class.extend({
   },
 
   escape: function(str) {
-    return str.replace(/'/g, "\'");
+    return str.replace(/'/g, "''");
   }
 });

lib/driver/mysql.js

@@ -186,7 +186,7 @@ var MysqlDriver = Base.extend({
       columnNames += '`' + columnNameArray[index] + '`';
 
       if (typeof(valueArray[index]) === 'string') {
-        values += "'" + valueArray[index].replace("'", "''") + "'";
+        values += "'" + this.escape(valueArray[index]) + "'";
       } else {
         values += valueArray[index];
       }