- Changed the API calls to match changes on fitbit end of things.
- Added get_sleep_data()
- Added get_premium_export()
- Changed output column of get_daily_data(), get_15_min_data(), and get_weight_data() to correspond to the data type requested... for example: "weight" instead of "data"", "steps" instead of "data"
- Added heart-rate for get_15_min_data() and get_daily_data()
- added get_intraday_data()
- Deprecated get_15_min_data(), use get_intraday_data() instead
- Basic checks included for arguments
- tz added to the return dataframes as.POSIXct date field
- documentation cleanup
- No error checking
- Three functions: login, get_daily_data, get_15_min_data