Added decorator validator WIP
Added decorator validator WIP
return validator instance from validator decorator.
Added docs for validator decoratror
added validator_test
Work on mapping iteration and field validation.
Merge branch 'feature/validators' of github.com:mikeywaites/kim into feature/validators

Conflicts:
	kim/validators.py
removed function to validate data type
More documentation and added from_value to Types api
Added some tests for mapping_iterator.
Dont raise ValidationError for TypedType when source_value is None
Integer type should inherit from TypedType.
Updated docs for MappedType.
removed validators module and tests
Updated doc strings
added support for specifying allow_none for TypeMapper's.
More tests for String type Integer type and TypedType.
Added .coveragerc to exclude coverage for tests.
Merge pull request #1 from mikeywaites/feature/validators

Feature/validators