Pyfield

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* add more validator
- ipv4 validator
- mac addres validator
- credit card validator

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* add builtin validator
* add example in docs

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* Remove py2 support
* fill up changelog
* fill README and docs
* add prompt_input
* add builtin email validator
* add expynent requirement

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* add default
* add validator
* move test
* transformation in type not required
* Merge branch 'master' of https://github.com/Ublimjo/pyfield
* remove unused duplicated code
* more open transform
* add transformator
* Fix contributing link
* Reach 10/10 pylint
* Add Contributing guideline
* Add boolean field

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* Add real number field
* Add integer field
* Update text field
* Initial commit