[#57] exit/logout confirmation when selling btc
[#63] blockchain.info base58 format detection
update hashes
[#61] ORDER_DEFAULT_EXPIRATION = 1080
fix comment
update bitcoinjs version in bower.json
merge develop in bitcoinjs
fix for validation on increased block expiration time
closes #64, closes #65, closes #66
fix expiration max validator
closes #57
merge develop into bitcoinjs
add unconfirmed_change param