0.14.0 - 2018-08-22

Add regtest network to Network enum
Add Script::is_op_return() which is more specific than Script::is_provably_unspendable()
Update to bech32 0.8.0; add Regtest bech32 address support
Replace rustc-serialize dependency with hex as a stopgap toward eliminating any extra dependencies for this; clean up the many independent hex encoders and decoders throughout the codebase.
Add conversions between ChildNumber and u32; make representation non-public; fix documentation
Add several derivation convenience to bip32 extended keys
Make deserialize::deserialize() enforce no trailing bytes
Replace TxOutRef with OutPoint; use it in TxIn struct.
Use modern as_ to_ into_ conventions for array-wrapping types; impl Display rather than ToString for most types
Change script::Instructions iterator to allow rejecting non-minimal pushes; fix bug where errors would iterate forever.
Overhaul util::Error; introduce serialize::Error and use it for SimpleDecoder and SimpleDecoder rather than parameterizing these over their error type.
Overhaul UDecimal and Decimal serialization and parsing and fix many lingering parsing bugs
Update to serde 1.0 and strason 0.4
Update to secp256k1 0.11.0
Many, many documentation and test improvements.