added example server setup page, links from README and How-do-I-run-my-own
fixed quote error, and typos and cleaned up wording
added comments re: port forwarding in DNSChain unit file, using open port
renamed example-server-setup.md file and made links to it more specific
changed section header to reflect new naming text for server setup guide
Merge pull request #88 from mdw/docs

Added: `Guide to Setting Up DNSChain + Namecoin + PowerDNS on Debian Wheezy`