Allow chaining of commands, and allow using beany to delete jobs non-interactively

[mattconsto]

It would be useful to chain commands. This is primarily to allow you to use beany to connect to a remote beanstalk server, and then run a command on that remote beanstalk sever:

$ beany connect some_server
Connected to 'some_server:11300'
$ beany connect some_server list
strconv.Atoi: parsing "list": invalid syntax
$ beany 'connect some_server; list'
2020/08/07 11:20:31 incorrect input, try 'help'

It would also be useful to delete jobs non-interactively:

$ beany delete-ready some_tube
Are you sure you want to delete all ready jobs from the some_tube tube [yn]? y
Deleted 10 ready jobs
$ beany delete-ready some_tube -y
Too many arguments provided