A few additions

* RPC methods
  * `AsyncServiceClient`: when you don't want to wait, and don't care about the result
  * `EasyActionServer`: when you want to implement a RPC provider in 3 lines
* General convenience
  * `@configurable`: when you want easy configuration for your classes, with default values
* HCI
  * `ReemLedClient`: to set the color of REEM's ears