Matches the LDP spec more closely

Instructions:

1. Download the file for your platform (ldpserver_mac or ldpserver_linux)
2. Make the file executable: chmod u+x ldpserver_mac
3. Run the file: ./linux_mac

By default it will listen for requests in http://localhost:9001

Changes in this release

• Better handling of non-RDF sources
• Prevent clients from updating server-managed properties
• Supports HTTP DELETE
• Minor tweaks here and there to use Go idioms and libraries