Fix cannot add validators to fields

Merge pull request #26 from localmed/cannot_add_validators_to_fields

Cannot add validators to fields

Add EnumField

v0.9.0

Bump version: 0.8.0 → 0.9.0

Add support for custom error message

• Add support for custom error message when declaring a field

Add EmailField

• Add support for EmailField
• Add support for ChoiceField

Defining Meta class on serializer is not required

• Defining Meta class on the serializer class is not required.

Fix serializer attempting to get attributes from null object and failing

• Add ability to set allow_blank_source on serializer class. If this is set to True the serializer class will not throw error if source is not available.

Fix bug where nested serialization where caching data

• Fix bug where nested serialization where caching data.

Add support for MethodField

• Add support for MethodField

Bug fix with serializer failing to find source with dot syntax

• Fixes bug with defining source with dot syntax

Add commonly used fields

• Add support for FloatField
• Add support for DecimalField
• Add support for DictField
• Add support for UrlField
• Add support for BooleanField
• Add support for RawField