Add initial transaction parser

This parses the rss feed for a cik and form type and
returns all the results to a callback as objects.
Add type to transaction object
Keep id as string instead of int

Leading zeroes are required in URLs using the id as
a segment.
Set owner=only on form 4 requests
Export transactions class
Add fetching of form four for transaction
Add initial ceo command
Rename getTransactions() to fetch()