Reorganised env files, added keychain support.

gpg-agent simply broken for ssh keys, so added keychain to startup
scripts to handle ssh.
Renamed a few env files,
More mail related settings.

Signature files (and symlinks to scripts) along with xface PBM file.
Added timeout value for ssh-agent.
Updated config files.

Ignore CVS and __pycache__ directories for completion.
Use single quotes for aliases so environment variables aren't expanded too
soon.
Merge branch 'master' of github.com:potyt/dotfiles

Pulling in README.md committed on github.