add into cli

[mrocklin]

$ head foo.csv
name,balance
Alice,100
Bob,200

$ into foo.csv foo.json

$ head foo.json
{"balance": 100, "name": "Alice"}
{"balance": 200, "name": "Bob"}

$ into foo.csv mongodb://localhost/db::foo
$ into foo.csv postgresql://postgres:postgres@localhost::foo --has-header True

[mrocklin]

I'll probably rename pandat to just into

[quasiben]

LGTM!

[mrocklin]

See also future work at #79

[mrocklin]

@quasiben should parse strip quotes from arguments?

[mrocklin]

Merging this. We can iterate in the future.