Rename `delete:` to `deleteItem:` to avoid conflict.
Change synchronizable `#if`s
Version 1.2.0
fix a memory leak
Merge pull request #40 from kyamada-github/fix-a-memory-leak

fix a memory leak
Test cases added

Code Coverage:
86.7% SSKeychainQuery.m
100 % SSKeychain.m
Merge pull request #41 from hashier/add_test

Test cases added