Resource Meta classes don't support inheritance

[dharvey-consbio]

It's because the Meta classes are processed at class-definition time, and removed afterwards. By the time an inheriting class definition is processed, the Meta class has been removed from the parent.

For example, the following results in this error:

AttributeError: type object 'BaseResource' has no attribute 'Meta'

from restle.resources import Resource

class BaseResource(Resource):
    class Meta:
        case_sensitive_fields = False
        match_fuzzy_keys = True

class ArcGISResource(BaseResource):
    class Meta(BaseResource.Meta):
        get_parameters = {"f": "json"}

[dharvey-consbio]

Another closely related improvement would be to make ResourceOptions supported by the Meta class overridable in inheriting classes:

from restle.resources import Resource

class BaseResource(Resource):
    class Meta:
        case_sensitive_fields = False
        match_fuzzy_keys = True
        custom_meta_prop = "custom_val"

Currently the way restle.resource.ResourceBase handles restle.options.ResourceOptions prevents this.