Added importance_score, customer_score

Perhaps a bit unnecessary at this point, but looking ahead we'll need
to base api crawling on more than just the company's quality score
(based on its metrics), but on other things such as how many customer's
are interested in a company.

the customer_score script gives a rating for how many customer are
interesed in that company (for now, all companies have a score of 0).

The importance_score scripts gives the final rating for the comany
based on the intermediate scores (eg. quality_score, customer_score).
The script returns the max of each of the intermediate scores.