added additional connection options

Now it is possible to provide additional connection options to the
client.

For example it was not possible to connect to SSL-enabled IIS servers
due to not supported encryption.

use the following args when connecting to IIS with SSL:

args = {
path: {"type": "Events", scope: "Main"},
parameters: {},
headers: {"x-bwin-accessId": ""},
connOptions:
{
secureOptions: constants.SSL_OP_NO_TLSv1_2,
ciphers:
'ECDHE-RSA-AES256-SHA:AES256-SHA:RC4-SHA:RC4:HIGH:!MD5:!aNULL:!EDH:!AESGCM',
honorCipherOrder: true
}
}