Import data from csv and turn into vectors.

Take item descriptions and turn them into vectors.
Take tagged items and turn them into tag vectors.
add join command.
Use OneVsAll to calculate theta for predictions.
Predict tags for items.
Create tags.vec to allow joins.
overhaul join_csv.py.
Change output format to make csv compare work.
Move off json so we can join all the things.
Separate create_table from create_table_with_index.
Check predictions.
fix call to create_table.
fix argument order issue.
fix quoting in join_csv.