[pass] Output from pass generate should go to stderr

[Lie Ryan]

Currently, the output of `pass generate` cannot be piped into another
command that expects a password because it contains git output and other
interactive outputs. For example:

    openssl genpkey -algorithm RSA -pkeyopt rsa_keygen_bits:2048
-aes-256-cbc -pass file:<(pass example.com.key 30 2>/dev/null) -out
example.com.key

Fails because pass outputs the git commit messages into the named pipe
passed to -pass.

The attachment is rudimentary attempt to send most output from generate
to stderr except the password itself.

Maybe a better implementation is to have an explicit --quiet option?
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