* Initial commit
* Adding informational comments
* Adding changelog fragment
* Fixing CRLF changelog fragment
* Refactoring public number parsing and added chaining for writer methods
* Adding more descriptive error for invalid certificate data
* Fixing signature data parsing
* Correcting ed25519 signature type to binary
* Applying initial review suggestions and fixing option-list writer
* Applying review suggestions
* Making OpensshWriter private
* Refactoring openssh_keypair for multiple backends
* Fixing cryptography backend validations
* Simplifying conditionals and excess variable assignments
* Fixing docs and adding cleanup for integration tests
* Fixing docs and public key validation bugs in crypto backend
* Enhancing cryptogagraphy utils to raise OpenSSHErrors when file not found
* Adding missed copyright and cleanup for idempotency test keys
* Fixing doc style
* Readding crypto/openssh for backwards compatibility
* Adding changelog fragment and final simplifications of conditional statements
* Applied initial review suggestions