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CommandHandler: fix total block estimation when no peers connected
create log dir if missing
make base58 im/export work for privkeys with compressed pubkey
move min_size validation into "standard" check
fix memory leak in Bitcoin.regenerate_public_key
update dns_seeds and add checkpoints
add alert_pubkeys for testnet
fix Block#bip34_block_height
refactor Bitcoin::Script#get_multisig_addresses
add Bitcoin::Script.is_canonical_pubkey?
fix unpack in Bitcoin::Script#parse for OP_PUSHDATA2, OP_PUSHDATA4
fix script serialization roundtrips

  testnet3 has some scripts with evil handcrafted pushdata chunks like "\xed\x01\x00\xdd" which is OP_PUSHDATA2 with a length that should be OP_PUSHDATA1.

  bitcoin-ruby used to serialize it to "dd", but when trying to recreate binary from it again the result is "\x01\xdd" because no way the Script.binary_from_string knew the original payload used OP_PUSHDATA2.

  for these edge cases its now serialized to "<opcode-pushdata-value>:<length>:<hex_data>", so "77:1:dd" in the example case,
  but only for pushdata that isn't in the range of the pushdata length for backwards compatibility of script strings.
Block and TxIn: add convenience method
add Script::OP_RETURN