Fix CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF warnings.
Merge pull request #278 from scelis/fix_block_warnings

Fix CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF warnings
Added some warnings, and fixed some warnings.
Fix typo, should be FMDB.h not .m
Merge pull request #281 from DaleJefferson/master

Fix typo, should be FMDB.h not .m
Merge pull request #14 from ccgus/master

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