Inital upload of a standard scaler that supports pandas dataframes as input. Maybe it should be renamed to DataFrame scaler to match the parser_to_dataframe.py file...

Using scikit-learn's StandardScaler as a base. Saving and loading is a bit tricky as the internal state of the scikit-learn implementation isn't easily saved. It looks like you can save it's internal __dict__ and then set the attributes on load, but I'm not sure if this is robust...

The implementation avoids using scikit-learn entirely for a number of reasons including no option for axis changes and no option for changing the epsilon value when dealing with small variances.

Saving and loading configurations are now done by utility functions in the utils folder. This simplifies the modules and allows for unit testing on the config I/O functions outside of any module.
Utility functions try to properly handle FileNotFound and FileExists errors.

[save/load]_config --> [save/load]_yaml_config to avoid confusion if we want another version for JSON or something else.

Adding lots of additional documentation. Some functions aren't fully documented, but this is a very good start.

Unittests still work and changes seem to mostly be single quotes to double and removing spaces.

This reverts commit f759eba.