correct notes
Use now a global varialble GR_PKGS_ROOT to define the linked ressources
Simple test to verify that the slf4j-android logger is working
corrected to use the open-source API rather than Google API
corrected to use the open-source API rather than Google API
Simple test to verify that the slf4j-api and log4j-1.2 implementation is working
adapted the notes to the more recent workspace creation and dependencies installation