5 * Add a 'Config::combine()' method for importing without overwriting.
6 * Factor out ArrayUtil as a reusable utility class.
10 * BUGFIX: Go back to injecting boolean options only if their value is 'true'.
14 * Add an EnvConfig utility class.
15 * BUGFIX: Fix bug in envKey calculation: it was missing its prefix.
16 * BUGFIX: Export must always return something.
17 * BUGFIX: Pass reference array through to Expander class.
21 * BUGFIX: Allow global boolean options to have either `true` or `false` initial values.
25 * Inject default values into InputOption objects when 'help' command executed.