Clean up some cruft

Remove an uneeded file and remove a stray Pry requirement.
Disable redmine and jira CLI interfaces

All CLI interfaces need to be re-worked, starting with Trello. JIRA and Redmine
will be broken for a while.
Re-organize Trello subcommand

A few big changes, but no real difference in the API:

  - GLI support for config files is now used properly. This means that each
    command doesn't have to duplicate logic for loading the config which was
    just plain stupid.

  - Trello commands now declare flags. This means data parsed from the config
    file will automagically populate option hashes passed to comamnds.

  - A default action has been added to Trello that lists the boards that can be
    viewed using the supplied credentials.

  - An export action has been added to Trello that dumps a board to JSON. This
    is useful for backing up board data --- especially since the purge command
    will curb stomp your data.