Added '--installed' option to `deps` command.

When deps command is passed this option, it will only show the dependencies
for the installed forumas. This option overrides the '--all' option.

Closes #18276.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
git-flow-clone: updated to work with git-flow-avh

- Removed dependencies and updated caveat
- Caveat now uses#{HOMEBREW_PREFIX}/bin

Closes #17667.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>