Gather/create datasets for auto analysis validation

[bbengfort]

We need a variety of datasets to show that our auto analysis technique works/doesn't work and how completely it works, and when it fails.

Consider data sets with:

• a variety of delimiters and escape characters
• headers and no headers
• rows of varying lengths
• columns of many different data types
• datasets with errors (multiple datatypes per column)
• datasets with null values of a variety of types

[rebeccabilbro]

I'm noticing that a lot of the best datasets (e.g. the ones in the worst shape) , I can't even get Trinket to upload. See issue #45