Create generateAPNSPemKey.sh

This is the file referenced in the APNS HOWTO video which helps glue together non-pw protected APNS cert and key files into the PEM file you submit to PubNub via the admin console.
adding APNSvideo howto project
CL
Update README.md
adding supporting apns file
Merge branch 'master' of https://github.com/pubnub/objective-c
Update README.md
Merge remote-tracking branch 'upstream/master'