updated df to remove index column from output

[leemlb06pmi]

Resolves #277

Explanation

made a small change to the dataframe as it gets added to the dictionary of mart instance dataframes so that we leave off the index column.

This will work for any number of additional marts we decide to add down the road

Rationale

by request!

Tests

I verified the output file:

testing logs

``` ```

[lprzychodzien]

Have you tried changing the parameter in the to_csv function to false? https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.to_csv.html

mart_dfs[k].to_csv(csv_buffer, index=False)