Add FileSerializer
Fix the change is not notify when Delete() is executed
Merge pull request #185 from Wendly/delete

Fix the change is not notify when Delete() is executed
Merge pull request #183 from Wendly/file

Support serializer for file
Fix it's not only delete single row when call Delete().executeSingle()
Merge pull request #187 from Wendly/delete

Fix it's not only delete single row when call Delete().executeSingle()