Attempting to add the pinning mode as an example.
Fixed SSL Pinning
- SSL Pinning switch case was not being applied if a .cer file was found in the bundle.
- SSL Public Key pinning was broken because we didn't make a call to SecTrustEvaluate before SecTrustCopyPublicKey
Clean up
Added guard around adding a NULL object to an array
Revert "Added guard around adding a NULL object to an array"

This reverts commit c8e420990efc80a1eba059f9c34fab0023efdcfc.
Merge pull request #900 from kcharwood/ssl_pin_example

Fix SSL Pinning
Merged upstream/master back to resolve conflicts