Merge branch 'jinja2' of https://github.com/matthewelse/yotta into matthewelse-jinja2
logging level must be integer in python 3
Merge branch 'jinja2-fixes' into yotta3
building works in python3
Merge branch 'master' of github.com:ARMmbed/yotta into yotta3
Merge branch 'yotta3' of https://github.com/autopulated/yotta