First, clean up the original a little
Refactor for clearer syntax and variables

This was done on a barely configured Windows machine, so mind the tabs.
Retab bitcoin_jacker.rb
DRY up bitcoin_jacker.rb, support Armory

Also, make the process killing optional.
Default false KILL_PROCESSES for bitcoin_jacker

I seem to able to read associated wallet files while these processes are
running with the greatest of ease. Maybe there was a file locking
concern, but I haven't run into it. Feel free to avoid landing this
particular commit if you disagree.
Land #2807, @todb-r7's armory support for bitcoin_jaker
Delete comma