comment/todo re: directory creation
show staging directory (caskroom) in doctor

refs #6471
Update Gambit Scheme to 4.7.3
Validate value of GPG :key_id

The value of `:key_id` must be an hexadecimal string of length 8, 16,
or 40.
Update GPG tests to use valid key IDs
Test for invalid GPG key IDs
Merge pull request #6484 from ndr-qef/gambit-scheme

Update Gambit Scheme to 4.7.3
Fix caveats os_version_only Tiger support
Update Seil to 10.11.0
Merge pull request #6488 from meunierd/master

Update Seil to 10.11.0
Merge pull request #6487 from alexcruice/caveats-dsl-tiger-support

Fix caveats os_version_only Tiger support
User-friendly error messages for invalid options/arguments; fixes #5997

- Show a more user-friendly error message when dealing with an option whose (mandatory) argument is missing.

- Likewise, we show a more user-friendly error message when a given option is ambiguous. Examples:
    - Given `-f`, the parser successfully expands to `--fontdir`.

    - Given `-c`, we fail to expand because the parser can’t tell if the user means `--caskroom` or rather `--colorpickerdir`. This exception now results in a nicer error message.

- Some commands now result in a consistent error message when a required cask name is missing.
This affects all stable commands which require one or more cask names as arguments, i. e. `cat`, `create`, `edit`, `fetch`, `info`, `install`, `uninstall`, and `zap`.

- Up to now, the commands `cat`, `create`, `edit`, and `info` used to treat any unknown option as a cask name. This commit changes that behaviour to make it consistent to the rest of the commands (like `fetch`, `install`, `uninstall`, and `zap`), who have silently discarded any unknown option in the past, and continue to do so.
Add Bitwig Studio
Update Cloud to 3.0.1
Update filebot.rb

+ FileBot 4.5
Merge pull request #6486 from ianks/bitwig

Add Bitwig Studio
Merge pull request #6490 from rednoah/patch-1

Update filebot.rb
Add tests for #5997
Rewrite tests to make them work with Ruby 1.8
Merge pull request #6492 from federicobond/cloud-3.0.1

Update Cloud to 3.0.1