working on #16 - sensore noise
added skeleton for testing the noise of the sensor
added subscribe to joint states, test, start sensor noise test if not simulated
Merge branch 'development' into F_sensor_noise
added spinonce + sleep cycle to get the subscribed messages in the tests
testing that the noise stays in a given threshold for 2 seconds
Fixes #16 - using smaller threshold of 0.5deg, failing if noise = 0.0. Test fails because fingers in bag file are moving.
Merge branch 'F_sensor_noise' into development

Conflicts:
	sr_self_test/CMakeLists.txt
	sr_self_test/include/sr_self_test/sr_test_runner.hpp
	sr_self_test/src/sr_self_test.cpp
	sr_self_test/test/test_self_test.cpp