support BIP32 absolute path in BIP32::build_key
sign p2sh inconsistent signature
debug
BIP39
added notes about ext-intl
added generating entropy for BIP39
added bip39 example and the strong argument of openssl_random_pseudo_bytes
Merge branch 'bip32-absolute-path' into blocktrail
Merge branch 'sign_p2sh_master' into blocktrail
removed debug