unit test for event management command
using a struct to transfer data threw command
Update CMakeLists.txt

Debug build by default.
Update .travis.yml

No need to make install anymore. 

ToDo : make Experimental; make cppcheck
Move plugin-specific files and interfaces in their respective plug-ins
Re-enable inspector
Fix tests running
Merge and fix tests
Merge branch 'master' of https://github.com/OSSIA/i-score into refactor/plugin_factories
Enable testing on travis