call SecTrustEvaluate before calling SecTrustGetCertificateCount

SecTrustGetCertificateCount's documentation says SecTrustEvaluate must be called before calling it. Without calling it, SecTrustGetCertificateCount returns 0 in OS X 10.7.
Merge pull request #1993 from minorblend/af_1.x

call SecTrustEvaluate before calling SecTrustGetCertificateCount
Applying equivalent patch for 830cc8df3ca6a564b7675672279c7715a56b2718, addressing a security vulnerability caused by known multipart form boundaries
Applying equivalent patch for 4c20a5ea38a50f119c9e8ac3d91fb199192a1d57, which fixes potential non-terminating loop in connection:didReceiveData:
Bumping version to 1.3.4
Merging fix from master for NSCache not automatically responding to memory warnings in iOS 7 [Issue #1268]
Merge pull request #2019 from chairish/manual-nscache-evict

Manually evicting UIImageView category's NSCache on UIApplicationDidReceiveMemoryWarningNotification
Fixing and suppressing various compiler warnings
Merge branch '1.x' of github.com:AFNetworking/AFNetworking into 1.x