all: update author list and licenses

AUTHORS

accounts/abi/bind/topics_test.go

accounts/abi/method_test.go

accounts/accounts_test.go

accounts/external/backend.go

accounts/url_test.go

accounts/usbwallet/trezor/trezor.go

cmd/abigen/main.go

cmd/checkpoint-admin/common.go

cmd/checkpoint-admin/exec.go

cmd/checkpoint-admin/main.go

cmd/checkpoint-admin/status.go

cmd/clef/tests/testsigner.js

cmd/ethkey/changepassphrase.go

common/compiler/solidity.go

common/compiler/solidity_test.go

common/fdlimit/fdlimit_darwin.go

consensus/ethash/sealer_test.go

contracts/checkpointoracle/oracle.go

contracts/checkpointoracle/oracle_test.go