Restructuring commands to utilize new CommandPlugin class.
Removing unnecessary NAME property.
Updating existing plugins to 1.x spec.
Updating documentation and cmdline functionality to follow the 1.x command plugin spec.
Updating existing tests to match 1.x spec.
Removing code for calculating ticket URL from folder path; moving to migration for backward compatibility.
Properly display per-command help if using '-h' or '--help' flags.
Slightly alter 'debug' command to import at runtime.
Final tweaks and cleanup.
Fixing bug in exception handling when invoking jirafs outside of ticketfolder.
Pass command_name to executor when running for subfolders, too.
Simplifying plugin class attribute logic.
Mock out 'pull' when testing 'push'.