Date fields are serialized incorrectly

[marshall007]

When uploading a form containing date fields, the serialized Date strings contain double quotes. Here's an example form submission (note the effective_date field):

------WebKitFormBoundary9l5lPA9GRtBjP1u9
Content-Disposition: form-data; name="type"

static
------WebKitFormBoundary9l5lPA9GRtBjP1u9
Content-Disposition: form-data; name="name"

2015 Pricing
------WebKitFormBoundary9l5lPA9GRtBjP1u9
Content-Disposition: form-data; name="effective_date"

"2015-03-31T05:00:00.000Z"
------WebKitFormBoundary9l5lPA9GRtBjP1u9
Content-Disposition: form-data; name="file"; filename="data.csv"
Content-Type: text/csv

------WebKitFormBoundary9l5lPA9GRtBjP1u9--

[danialfarid]

Fixed in version 3.3.0