Form_Field_Time/Date

1. Form_Field_Time - not complete solution, but at least will not throw exceptions
2. Form_Field_Date - simplify code, remove obsolete comments
Update lib/Form/Field.php

1. Fix comment
2. Rewrite of Form_Field_Number and Form_Field_Money
Merge pull request #228 from DarkSide666/patch-21

Form_Field: Time/Date/Number/Money