Implement remaining Strava API methods

[dblock]

The heavy lifting of setting this thing up is done, all Athlete APIs are implemented, so now we just need API implementations.

Everything remaining from https://developers.strava.com/docs/reference

• [x] Activities
  • [x] Create an Activity
  • [x] Get Activity
  • [x] List Activity Comments
  • [x] List Activity Kudoers
  • [x] List Activity Laps
  • [x] List Athlete Activities
  • [x] Get Activity Zones
  • [x] Update Activity
• [x] Athletes
  • [x] Get Authenticated Athlete
  • [x] Get Zones
  • [x] Get Athlete Stats
  • [x] Update Athlete
• [x] Clubs
  • [x] List Club Activities
  • [x] List Club Administrators.
  • [x] Get Club
  • [x] List Club Members
  • [x] List Athlete Clubs
• [ ] Gears
  • [ ] Get Equipment
• [ ] Routes
  • [ ] Export Route GPX
  • [ ] Export Route TCX
  • [ ] Get Route
  • [ ] List Athlete Routes
• [ ] RunningRaces
  • [ ] Get Running Race
  • [ ] List Running Races
• [ ] SegmentEfforts
  • [ ] List Segment Efforts
  • [ ] Get Segment Effort
• [ ] Segments
  • [ ] Explore segments
  • [ ] Get Segment Leaderboard
  • [ ] List Starred Segments
  • [ ] Get Segment
  • [ ] Star Segment
• [ ] Streams
  • [ ] Get Activity Streams
  • [ ] Get segment effort streams
  • [ ] Get Segment Streams
• [ ] Uploads
  • [ ] Upload Activity
  • [ ] Get Upload

[dblock]

https://github.com/dblock/strava-ruby-client/commit/5f0724ec8414367fa03ed134ab3be05290b46757