Add operation support with RESTier own controller

[chinadragon0515]

Current in RESTier, the operation (function and action) are supported with additional controller and WebApi ODataRoute attribute, add support with RESTier controller.

Need to support both bounded and unbounded operation, and also support in batch request.

Before this is added, consumer can create separate controller to support operation, docs will be added for this part.

[chinadragon0515]

The current way to support operation, refer to document http://odata.github.io/RESTier/#03-03-Operation, thanks.

[chinadragon0515]

This issue will be resolve in several steps,

1. unbound function with zero or one parameter.
   2.unbound function with more than one parameters.
   3.unbound action with zero or one parameter and without request body
   4.unbound action with zero or one parameter and with request body
   5.unbound action with more than one parameters and without request body
   6.unbound action with more than one parameters and with request body
2. bound function support
3. bound action support

[chinadragon0515]

1,2,7 are supported with PR #424, and note path segment after function is not supported yet.
Query options for function is supported with same PR.

[chinadragon0515]

Action part are supported with PR #453, all code has merged.
Keep this issue open for document purpose only.

[chinadragon0515]

document updated.