all sub-modules and action and service wrappers should use this->module_nh.getNamespace() for the namespace parameter.
  all modules used directly from a ROS node should use ros::this_node::getName().

Added functions to enable and disable the watchdog.
Modified the function to set the watchdog period. It is now enable_watchdog(time).

Solved a problem in the namespace generation. Now the modules action and service clients require the full namespace as a parameter.

Removed the status check in the is_finished() and cancel() functions to be able to perform the desired operations when a timeout or watchdog error have been reported.

The new errors taken into account are:
	* the parameter does not exist.
	* the parameter has not been changed.

Removed some unused internal variables.

iri_ros_tools: package.xml: updated license (TODO->LGPL), mantainer (labrobotica) and author (shernand)

Added a function (start_operation()) to be called in the constructor of the lowest class in the hierarchy.
Added an exception module.
Added a new class to implement the service call to dynamic reconfigure servers.

Removed the update function from the watchdog class.