add action pipeline support

[mgutz]

This allows action to be an array of middleware instead of a single handler. For example, we have middleware to do oauth2 scope checks, role checks etc.

var operation = {
  spec: {...},
  action: [
    authorize({ scope: 'rwx:verification', audience: 'api' }),
    function (req, res) {
      // do work here   
    }
  ]
};

[fehguy]

@jsdevel this looks good, any concerns?

[jsdevel]

@mgutz even though this is just formatting, I would prefer to see it in a separate commit.

[jsdevel]

@fehguy thanks for the include!

Ideally I'd like to see express leveraged to the max, but in this case I'm not sure how else we would go about it. @mgutz can you think of any other way we could accomplish this without changing swagger?

Overall, I feel these changes provide a lot of value and I'm also thankful that @mgutz provided tests!

[ablankenship10]

+1 on added value, definitely a must have.

[tcbeutler]

Could really use this for route specific middleware...

[fehguy]

Hi folks, we've been pretty busy with the swagger 2.0 release, which was Monday. Getting back to this shortly

[cheerfulstoic]

Any progress? ;)

[plumpNation]

Is this going in soon?

[fehguy]

Not soon, we are discussing the architecture for the port to swagger spec 2.0 (per #180). At the same time looking at what changes an updated design (such as apigee-127, swagger-n) provide, and if we should work on those projects.

[ericrini]

+1 are you guys not accepting pull requests?

[plumpNation]

I have achieved this using the excellent middleware-flow module. I'm pretty sure it achieves the same thing.

[fehguy]

Closing as #207 will completely replace the implementation in this project.