Fixed errors with submitted select field values

When using this library to submit multiple select fields in the same form, the select field values were not captured in the form's POST data due to the name attribute not being set. Even after fixing this issue, select fields after the first would include duplicate copies of the first field's options, as well as setting the default selected option to that of the first select field for all fields. I'm sure other users who use this plugin for complex forms will appreciate these bugs being fixed.