Support CREATE/UPDATE/DELETE actions on features

[HoJeong Go]

Reading values are not that difficult as we don't need to fill all actual values. However, as the library handles real environment, we need to reduce possible variables by analyzing many cases. In creating, updating, or deleting resources on real router, it's ciritical task.

Feature implementation status

• UPDATE values on Wireless AP settings (#3)

Development

We start on individual branch and merge them into alpha/add-setters. Eventually, we can merge alpha/add-setters to master branch safely.