Treant subclasses that use the same repr style can just inherit now.

No more hardcoding of treanttype in repr def

src/datreant/core/treants.py

@@ -114,7 +114,7 @@ def _write(self):
         return self._backend.write()
 
     def __repr__(self):
-        return "<Treant: '{}'>".format(self.name)
+        return "<{}: '{}'>".format(self._treanttype, self.name)
 
     def __getstate__(self):
         return self.filepath