Merge branch 'master' into TESTING_documentation_updates

controls/README.md

controls/documentation/SimulinkModel.md

controls/model/README.md

documentation/images/comp_graph_ex1.png

documentation/images/comp_graph_ex1_simu.png

documentation/images/comp_graph_reset.png

documentation/images/simulink_act_sys.png

documentation/images/simulink_control_sys.png

documentation/images/simulink_sensor_sys.png

documentation/images/simulink_top_level.png

quad/README.md

quad/doc/how_to_use_XSDK.md

quad/doc/images/FPGA_Diagram.png

quad/src/computation_graph/README.md

quad/src/computation_graph/computation_graph.c

quad/xsdk_workspace/README.md

quad/xsdk_workspace/real_quad/README.md