Add support for second passphrases

[karmacoma]

Accounts with a second passphrase enabled are unable to send LSK. We should add support for second passphrases so this is possible.

[fix]

There is secondsignature swicth in the json you get when polling an account, see http://108.61.99.136:8000/api/accounts?address=7136766316744460715L

Then using lisk js, is just adding the second passphrase as last arg when creating transaction