bash-completion support for opentxs

[kac-]

Add somewhere bash-completion for opentxs, can be placed in /etc/bash_completion.d/opentxs or anywhere with loader line in ~/.bash_profile : source ~/path_to_opentx_completion_file

https://gist.github.com/kactech/37bad93ffb205e7383d8

<script src="https://gist.github.com/kactech/37bad93ffb205e7383d8.js"></script>

[kac-]

updated file in gist note with smarter rules