swistakm / graceful / 51

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Pull #27

travis-ci

params: add option to specify param validation (refs #5)

Param validation is now handled by additional `validators` keyword
argument to `BaseParam` class. This is consistent with API of field
definitions so we favour the reuse of same validation functions.
This means that all existing validato function factories available
in `graceful.validators` module can be used with params too.
The fact that params have different source than fields (query
string instead of content-type serialized body) does not matter
at all because in both cases we work on deserialized/internal
values.

What is different is the way how validation is triggered. Field
validation is mostly managed by field definition class but param
validation is almost exclusively handled by
`BaseResource.require_params()` method.

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