Update links & etc.
Update links & etc.

* Make docs links local.
* Add RTD link
* Add docker info link
* Correct license
* Remove Grunt testing information.

telefonicaid/iotagent-mqtt,telefonicaid/iotagent-json,telefonicaid/iotagent-mqtt,telefonicaid/iotagent-mqtt,telefonicaid/iotagent-json,telefonicaid/iotagent-json