Re-try merge (#43)

* README update

* Purge masterhash()

* README.md update

* README.md update: 2

* Reinstate signedRedirect() & ownerhash[]

* some more NatSpec

* Goerli-v4: 0x4b9A4521442485ad7e1b25295125240b5f3F5aaC

* Remove redundant parts; more natSpec

* update ownerhash[addr] to accept keccak(addr)

* natSpec for GatewayManager

* Mainnet: 0x57532d78FfBcC6ac5534A9b39899C7eC89082CdA

* Fixes for bugs in v1-beta

* Fixes for bugs in v1-beta (#34)

* Some natSpec and fix for avatar/contenthash

* Updated Fixes in v1.0.0-beta (#36)

* Fixes for bugs in v1-beta

* Some natSpec and fix for avatar/contenthash

* Fix error in test.yml

* Fix errors in test.yml  (#38)

* Fixes for bugs in v1-beta

* Some natSpec and fix for avatar/contenthash

* Fix error in test.yml

* Review of #40

* Fix typo-2