Added closed socket detection

Added automatic disconnection when an exception is risen

added size to PayloadTooLargeError exception

Release 1.1.1: fixes bug where UTF-8 characters in payload can cause …

…unexpected "payload too long" error

Release 1.1 - adds custom notification payload functionality

Incrementing version number

Tweak to py_modules, misc tidying

Renaming to apns, pyapns already in use on pypi