Split off form field

It turned out I had a bit of time. See #16 
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Aaaaaargh ;)

On 5 October 2014 21:55:57 CEST, Simon Charette <notifications@github.com> wrote:
>>
>> +from . import forms
>> +from .formfields import RGB_REGEX
>
>`from . forms ...`
>
>---
>Reply to this email directly or view it on GitHub:
>https://github.com/charettes/django-colorful/pull/17/files#r18437012

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