response status override using self.status

[yuriescl]

Resource.status is currently being set but not used:
https://github.com/toastdriven/restless/blob/2.1.1/restless/resources.py#L82

An idea is to use it for overriding a successful response status, no matter the endpoint/method.
Example:

def update(self, pk):
    try:
        Post = Post.objects.get(id=pk)
        self.status = 200
    except Post.DoesNotExist:
        self.status = 201
        post = Post()
    
    post.title = self.data['title']
    post.user = User.objects.get(username=self.data['author'])
    post.content = self.data['body']
    post.save()
    return post

Fixes #118
If this gets accepted, please add it to documentation.

[yuriescl]

Nevermind this, closing.