Keychain 2.9.0_beta1 release:
* Fix gpg support and allow gpg-agent to be used as an ssh-agent if
found. --agents ssh now means "use gpg-agent if it has ssh-agent
support, or ssh-agent as a backup.". Add code so we don't try to
start two gpg-agents for --agents gpg,ssh or --agents ssh,gpg.
* Remove keychain.txt from git and add to .gitignore.
* Optimizing output messages.
* Add --nosub option to disable substitution of gpg-agent for
ssh-agent.