pushing before transfering ownership

added new tests and new helper classes
speed improvements
minor fixes

main.cpp

@@ -16,7 +16,7 @@ int main(int argc, char** argv) {
 #ifdef WITH_TESTS
 	::testing::InitGoogleTest(&argc, argv);
 	//::testing::GTEST_FLAG(filter) = "*Importance*";
-	::testing::GTEST_FLAG(filter) = "*Walk*";
+	::testing::GTEST_FLAG(filter) = "*Length*";
 
 	return RUN_ALL_TESTS();
 #endif