using official phpecc lib again since it has been updated.\nand added phpunit and phpcs as requirements
WP
added magic_p2sh_byte args. use NULL for magic_byte and magic_p2sh_byte args and fallback to default
easy way to import bip32 keys into wallet
added signing of transaction to bip32 example
added example of signing a p2sh 1 PK at a time
fixed docblock