New package structure for the version 2 of the public api.

Start building up the validators required for post notificaiton.
The app/v2/errors.py is a rough sketch, will be passed a code, the error can look up the message and link for the error message.

app/v2/errors.py

@@ -0,0 +1,29 @@
+from flask import jsonify
+
+from app.errors import InvalidRequest
+
+
+class BadRequestError(Exception):
+    status_code = 400
+
+    def __init__(self, message, fields, code):
+        self.code = code
+        self.message = message
+        self.fields = fields
+
+
+def register_errors(blueprint):
+    @blueprint.app_errorhandler(Exception)
+    def authentication_error(error):
+        # v2 error format - NOT this
+        return jsonify(result='error', message=error.message), error.code
+
+    @blueprint.app_errorhandler(InvalidRequest)
+    def handle_invalid_request(error):
+        # {
+        #     "code",
+        #     "link",
+        #     "message" ,
+        #     "fields":
+        # }
+        return "build_error_message"