Added Velo Hero service

Sync with www.velohero.com
Merge branch 'master' of https://github.com/Cyclenerd/tapiriik into Cyclenerd-master

Conflicts:
	tapiriik/services/__init__.py
	tapiriik/services/service.py
	tapiriik/web/views/privacy.py
Move activity GPS flag assignment into PWXIO
Fix activity private flag assignment