Update lib/spiceweasel/cli.rb

Fixing respecting the `--knifeconfig` option.

The breakage happens because `Config.merge!(@config)` happens after `parse_options` is called. Thus `Spiceweasel::Config[:knifeconfig]` does not exist yet.
This pull request fixes a spacing issue as well on line 201.
Merge pull request #25 from auser/patch-1

Update lib/spiceweasel/cli.rb