Add lifetime stats, friends and badges API

[chemelli74]

In order to get full stats and keep the gaming idea from FitBit, experience in HA should be enriched with:

• loading friends
• loading lifetime-stats for owner and friends
• loading badges for owner and friends

To do so support for 3 new APIs is needed:

Friends Lifetime stats Badges

Then a new config detail section can be added under the the platform:

friends:
  - "Fullname"
  - "userid"

This will load the same monitored_resources not only for owner, but also for specified friends.

Fullname and Userid (one is enough) can be obtained from opening the friend profile from the web page of owner profile.

Simone

[chemelli74]

New up-to-date library: https://github.com/chemelli74/py-fitbit

Simone