Fix compiler & analyzer warnings
Fix iOs SDK 6.1 compilation issue
ignore sign conversion warnings
Revert "ignore sign conversion warnings"

This reverts commit b230fde97b7384c26d2e7092fc82d703defff731.
Revert "Fix iOs SDK 6.1 compilation issue"

This reverts commit 9559246a3e5dff0538d83e3fafc52c243fbae7c3.
Revert "Fix compiler & analyzer warnings"

This reverts commit fbafd3fae825ab2d2e5c5899a9d4d6bd4094e8cc.
Merge branch 'master' of https://github.com/AFNetworking/AFNetworking
Wrap remaining OSStatus and NSCAssert with NS_BLOCK_ASSERTIONS macro to remove Analyzer warnings