Allow optional non-Optimist argv.

[evocateur]

This allows other arg parsers (e.g., nopt or any other argument parser that gives you a hash of options) to provide the argv that rc consumes. If no custom argv are provided, it trundles along as before with optimist.

[dominictarr]

The way this integrates is clean, but I'm not certain what nopt does that optimist doesn't.

What about nopt sold you?

[evocateur]

Other than "I was already using it, and don't want to migrate to optimist":

• Specifying parameters that are always Arrays, even with a single value: { "stuff": [path, Array] }
• Specifying parameters of an explicit type, or array of types, with the first success determining the choice: { "stringOrDate": [Date, String] }
• Shorthands that expand to composite longhands: { "s": ["--stuff", "--things", "foo"] }

Also, as @isaacs noted, type verification and custom parsing capabilities.

[dominictarr]

After much reflection (noting the way that nopt parses options when using npm, and asking myself what would it be like with optimist?) I have decided to merge this.

[dominictarr]

merged into rc@0.2.0

[evocateur]

Thanks!