lots of minor changes...

◦ README is markdown instead of pod (for Perl syntax highlighting)
◦ update build requirements
◦ require Perl v5.8.1 instead of v5.8 (for proper Unicode support)
◦ use namespace::clean and stop inheriting Carp functions
◦ update copyright date
◦ change copyright to Shutterstock (it's always been a Shutterstock project)
◦ docs: one space after period (http://chicagomanualofstyle.org/qanda/data/faq/topics/OneSpaceorTwo.html)
List::Util now provides any()
update test version diag