updates for @shutterstock

* remove dupes
* add locations
* bump dates

The following jobs are currently listed with Perl in their descriptions:
* Perl Software Engineer, New York, NY
* Perl Software Engineer, San Francisco, CA
* Perl Software Engineer, Denver, CO
* Perl Software Engineer, Austin, TX
* Software Engineer, New York, NY
* Software Engineer, San Francisco, CA
* Senior Software Engineer, New York, NY
* Infrastructure Engineer, New York, NY
* International Search Engineer, New York, NY

For details see:
http://www.shutterstock.com/jobs/listings