feature request: support for use of passphrase along certificate

[ciki]

Hi,

I wonder if support for certificates encrypted with passphrase could
be added to library.

All what is needed is adding a member $certificatePassphrase to
ApnsPHP_Abstract class which could be optionally set in constructor as
3rd argument and in method _connect() just test for its existence and
add it to stream options like this
if (!empty($this->certificatePassphrase)) {
stream_context_set_option($streamContext, 'ssl', 'passphrase',
$this->certificatePassphrase);
}