per-function exclusion of a route via an attribute

We have some endpoints that we'd like to to include in cbswagger output. It is very convenient for our use case to mark these at function definition sites. For example:

```
/**
* @noCbSwagger
*/ 
function someHandler() {}
function someOtherHandler() {}
```

In the above, `someOtherHandler` would make into docs (depending on configuration), but `someHandler` would be excluded from docs.