Things left unimplemented in RF 4.0.0.Final

1. Number converter, basic implementation doesn't support:
   1. Currency type format
   2. percent type
   3. pattern
   4. locale
   5. Limit number of integer or fraction digits
2. Date and Time converter, no JavaScript implementation yet.
3. JSR-303 Validators
   1. Validators that require number converter:
      1. @DecimalMin
      2. @DecimalMax
      3. @Digits
   2. Validators that require date/time converter:
      1. @Future
      2. @Past
   3. @Null validator, not sure that it makes sense on client side because input element value always contains some string.