Datetime and date-only query parameters are not converted to java.util.Date

Steps to reproduce for datetime:

1. Set `datetime` type for the query parameter.
2. Send request with following datetime value: `2016-02-28T16:41:41.090Z`.

Expected result:
The query parameter is successfully converted to `java.util.Date`.

Actual result:
The query parameter is `null`.

Steps to reproduce for date-only:

1. Set `date-only` type for the query parameter.
2. Send request with following date value: `2015-05-23`.

Expected result:
The query parameter is successfully converted to `java.util.Date`.

Actual result:
The query parameter is `null`.

Date format patterns are taken from https://github.com/raml-org/raml-spec/blob/master/versions/raml-10/raml-10.md#date