Handling various data types and models.

[CheViana]

Trinket should be able to handle the following types of data:

• [ ] csv
• [ ] json
• [ ] xml
• [ ] text
• [ ] graph (graphml)
• [ ] hdf5

It should not accept any other types of data.

For now we only have CSV handling, but each data type should have their own handling method.

[ojedatony1616]

For the short term, we are going to focus on csv, json, and text file types.