some minor, some major

- state that wiki is an external link (as should most external links be)
- separate pools to dedicated pools and multicoin pools
- fix link from old /r/ppcoin to new /r/peercoin on resources page
- also added a section of online shops that accepts peercoin as payment to encourage more businesses to do so and support the businesses who does.
- add peer4commit as a way to get peercoins
- contribute is now a dropdown menu with links to the old volunteer form and
- a new page called participate that contains ways user may participate in the peercoin community