0.0.21

• Rename RaspIot to Cleep everywhere in the project
• Clean core content (remove useless files, move some libs to module...)
• Add unittests for major core files (97% core coverage)
• Fix some minor and major issues
• Rewrite some libs
• Migrate to python3 (python 3.5)
• Update python dependencies
• Update installer to execute all scripts during .deb install
• Update frontend libraries
• Improve external bus