Make it possible to provide default values for query string and header params

[Tri125]

At the moment we can't specify a default value for params inside a resource or action.

[bits01]

I assume URL params implies both path and query params.

[Tri125]

I guess I should have called it Action/Resource Params. I'll edit to make it clearer.

[raphael]

@bits01 setting default values on path parameters doesn't make a lot of sense because the mux enforces they have values. It might be good to fail actually if defaults are provided for those with a nice error message explaining this. So we're talking about query string parameters and header parameters.

[bits01]

Ooops, didn't give it a lot of thought at 7am :-)

[stale]

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