added a bin utility for shredding

currently only parses the html for a particular hardcoded page, still
need's a lot of work
now iterates shredding each successive page

previously it used to shred just a static page, it is now capable for
_recursively_ requesting a successive page until it can no longer find
classifieds.

note: this was suprisingly harder to do than expected due to the
non-blocking async nature of node.js.  decided to use a recursive
approach due to the underdeterministic # of requests that is expected
to take place (http://stackoverflow.com/a/6048595)
handles all topics of classifieds (not just babies)

note: i've actually commented out everything in the array except the
top 2 - so that it doesn't take long to test.  when it's deployed to
production the full array should be used!
minor code clean up