Add new package, data_fusion_simple
Adds README.md with instructions.
Delete unmet dependencies
Fix cmake
More fixes
Add alert_handler node
Remove redundant object msg (Object.msg)
Changes in main(). Compiles successfully
slight rearrangement of main in hardware task
Add test and doxygen documentation to alert handler node

The test fails and produces the error:
unknown file
C++ exception with description "yaml-cpp: error at line 0,
column 0: bad dereference" thrown in SetUp().

same error that the test of PoseFinder produces indicating
that the tests cannot load the file map1.yaml.
Merge branch 'kouros_taras' into kouros_georgios