Add various dependencies;

- addressable (url parsing)
- pry-nav (debugging)
- rubocop (quality assurance)
- singleton
Started working on move functionality.
Remove extra space in help banner for subcommands.
Implement `troo move`;

- Remove CLI::Move.
Started work on configuration improvements.
Started working on own client implementation.
Extract methods.
Rename configuration files;

- Use the new configuration mechanism.
- Move initial configuration check to `troo init`.
Abort work on own client implementation.
Add local board, list and card count to `troo status`.
Add OAuth token and secret to configurables.
Implement optional board_id arg to `troo move`.
Merge pull request #16 from gavinlaking/feature/refresh

Feature/refresh