Stravaio

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New features:

- Added strava_oauth2() for local OAuth2 flow

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New features:

- removed __version__ from the stravaio

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New features:

- added __version__ to the stravaio

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Bug fixes:

- fixed dependencies

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New features:

- access to indivudual streams using class attributes
- __repr__ functions added to athlete, activity, stream class

Bug fixes:

- use of slang language e.g. "last week" in the after attribute

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Breaking changes:
- athlete_id must be passed explicitely to the activities and streams functions

New features:

- Added logging
- Added access_token error handling
- Added loading streams locally if exist
- Added examples with jupyter notebooks