Data/processing (#12)

# Initial progress 
* NYC Taxi Dashboard update (#7)
* [TEST] updated to process all Q1 data + rm elif cases & ChristmasNYC
* wildcard data path; map if/elifs; sql input errors
* need to find 'from download_sample_data import bar as progressbar' then this is ready
* first 100k rows converted 2015
* should work, for testing with hv
* for testing w/ ds/hv
* data seems to be the issue; origional convetsion not displaying properly either
#### Merge adjustments related to #12 
* Delete test_bsql_converted_taxi.csv
No longer in use
* Delete test_bsql_conversion.ipynb
No longer in use
* Delete bsql_preprocessing_taxi.py
No longer in use -> switch to `download_data.ipynb` of `data/download` branch