Removed APISpec module dependence from TD

src/labthings/labthing.py

@@ -95,7 +95,7 @@ def __init__(
         )
 
         # Thing description
-        self.thing_description = ThingDescription(self.spec)
+        self.thing_description = ThingDescription()
 
         if app is not None:
             self.init_app(app)

src/labthings/td.py

@@ -1,19 +1,12 @@
 from flask import url_for, request
-from apispec import APISpec
-import weakref
 
 from .view import View
 from .event import Event
-
 from .json.schemas import schema_to_json
 from .json.paths import rule_to_params, rule_to_path
-
 from .find import current_labthing
-
 from .utilities import get_docstring, snake_to_camel
 
-# TODO: Remove reliance on get_apispec() methods
-
 
 def view_to_thing_action_forms(rules: list, view: View):
     """Build a W3C form description for an ActionView
@@ -136,18 +129,13 @@ def view_to_thing_property_forms(rules: list, view: View):
 
 
 class ThingDescription:
-    def __init__(self, apispec: APISpec):
-        self._apispec = weakref.ref(apispec)
+    def __init__(self):
         self.properties = {}
         self.actions = {}
         self.events = {}
         self._links = []
         super().__init__()
 
-    @property
-    def apispec(self):
-        return self._apispec()
-
     @property
     def links(self):
         td_links = []