Added more metadata to Dask Dataframe creation #19
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It should return right away since we want to convert chunks lazily. From the profile traces, it looks like `to_dd` converts the chunks right away.
I found that either `from_delayed` or `from_map` took forever to get the length of era5. This looks like a more fundamental issue with Dask Dataframes. Instead, I checked how cast it was to get columns.
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Fixed #17. It looks like it is, in fact, lazily opened.
len(era5_df)requires a full scan. I opened #18 to address the length issue.