Add nikeplus service

- This still need my custom nike plus exporter to generate the csv that this
  script expects.  I'm planning on making the exporter a separate repo with a
  simple setup.py for installation.
- The docs will be updated and a requirements.txt file will also be added when
  this new repo is setup completely.  Until then comment on this commit, etc.
  if you would like this exporter code.
Add habit list service
Moved services to dayonetools/services for proper distribution
Add setup.py to install and wrapper to interface with all services
Remove unused imports
Move some imports internal so importing services package is not so cluttered
Add contribute docs and update readme for new layout/usage
habit list service needs json, not csv