Add run_for_uid task
Add couple of notes
First go at company json schema

More of a notes of work in progress than anything else. Also comments welcome on how granular we should go here -- should we include registered address at all, for example, if addresses are going to be data_objects/statements
Tweak :run_for_uid task, so that update_datum returns json to STDOUT
Merge pull request #18 from openc/company_fetchers

Company fetchers