Fixed #30 : Add variable support in BNF concept definition

Fixed #31 : Add regex support in BNF Concept
Fixed #33 : Do not memorize object during restore

tests/sheerkapickle/test_SheerkaPickler.py

@@ -2,7 +2,7 @@ import logging
 
 import pytest
 from core.concept import Concept
-from core.global_symbols import NotInit, NotFound, Removed
+from core.global_symbols import NotInit, NotFound, Removed, NoFirstToken
 from core.tokenizer import Keywords
 from sheerkapickle import tags
 from sheerkapickle.SheerkaPickler import SheerkaPickler
@@ -68,6 +68,7 @@ class TestSheerkaPickler(TestUsingMemoryBasedSheerka):
         (NotInit, {tags.CUSTOM: NotInit.value}),
         (NotFound, {tags.CUSTOM: NotFound.value}),
         (Removed, {tags.CUSTOM: Removed.value}),
+        (NoFirstToken, {tags.CUSTOM: NoFirstToken.value}),
     ])
     def test_i_can_flatten_and_restore_custom_types(self, obj, expected):
         sheerka = self.get_sheerka()