Garminconnect

* Replaced upload_fit_activity() with upload_activity() which supports more filetypes

* Added method to get training status

* Added method to get training readiness
* Added method to upload fit data from local file
* Enhanced example code
* Fixed bugs in example code
* More documentation
* Added example code
* When passing session file to init credentials are optional
* Multiple minor bug fixes
* Added method to retrieve available badge challenges
* Added method for retrieving non-completed challenges
* Added method to retrieve available badge challenges

* Fixed max_metrics call url
* Better session and cookie management

* Re-added get_activities_by_date()

* Added get_activity_evaluation
* Added get_earned_badges
* Added get_adhoc_challenges
* Added get_badge_challenges
* Added get_stress_data
* Fixed logging mechanism
* Better error handling
* More debug output
* Logout call fixed
* Added respiration and spo2 data
* Added get_last_activity
* Added url in forbidden url error message