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First working version, many changes, milestones included:
* basic templates and working versions of the ``Data``, ``QaQc``, and ``Plot`` classes
* versions and improvements to daily and monthly resampling
* Bowen and Energy Balance Ratio correction routines
* example Jupyter notebooks including with FLUXNET and USGS data
* calculation of potential clear sky radiation
* changing variable naming system to use internal and user names
* ability to read in multiple soil heat flux and soil moisture measurements and calculate weighted averages
* make package installable and Conda environment
* add input data filtering using quality control flags (numeric threshold and flags)
* reading of input variables' units
* added the ``util`` submodule with methods for resammpling time series
* ability to take non-weighted averages for any acceptable input variable
* add config file options like date parsing
* removed filtering and smoothing options from Bowen Ratio method and other modifications to it
* add methods for downloading gridMET variables based on location in CONUS
* add routine for gap filling ET based on gridMET ETrF that is smoothed and filtered
* improved ``Plot`` class to contain modular plot methods (line and scatter) for use with arbitrary data
* changed internal variable naming, e.g. etr to ETr
* methods to estimate ET from LE that consider the latent heat of vaporization is affected by air temp.
* other updates to improve code structure and optimization of calculations