fix autocomplete
fix setting board
fix readme completion instructions
Make client always a global
remove hardcoded 3 args case
replace custom ArgParser with subcommands
update completion for new arg system
fix other commands
board tests now do something
refactor init_client and fix test_token

from code review by zachallaun and staceysern
Add --limit argument to cards command
Merge pull request #3 from zachallaun/limit-cards

Add --limit argument to cards command