[CZ]t-zones: take potential captcha into account

Thanks Franta Mizera.
Fixes https://code.google.com/p/esmska/issues/detail?id=473
[CZ]t-zones_(free): add a new gateway

Thanks Franta Mizera.
Fixes https://code.google.com/p/esmska/issues/detail?id=470
[CZ]t-zones*: fix a bug in captcha

See issue https://code.google.com/p/esmska/issues/detail?id=473