Stravalib

- Added support for undocumented inclusion of laps in activity details. (hozn, 96)
- Added missing parameter for get_activity_photos (hozn, 94)
- Added missing activyt pr_count attribute (Wilm0r, 95)
- add "starred" property on SegmentExplorerResult (mdarmetko, 92)

- Fixed update_activity to include description (hozn, 91)

- More Python3 bugfixes

- Python3 bugfixes (Tafkas, martinogden)
- Added delete_activity
- added context_entries parameter to get_segment_leaderboard method (jedman)

- Use (require) more modern pip/setuptools.
- Full Python 3 support (using Six). (hozn, 69)
- Webhooks support (thanks to loisaidasam) (hozn, 77)
- explore_segments bugfix (hozn, 71)
- General updates to model/attribs (hozn, 64, 73, etc.)

- Renamed `Activity.photos` property to `full_photos` due to new conflict with Strava API (hozn, 45)