Replace links to code.google.com; update copyright date

Remove links to old issue tracking system and wiki and update copyright date to current year
Add @shawnacscott to CONTRIBUTORS.md
Update INSTALL.md

Add internal links to section headers and supporting files. Test and update external links. Add additional resource links for learning git. Clean up grammatical errors. Rearrange 'Setup' section to clearly mark optional steps, and add links to needed steps listed in 'Production,' but not 'Setup.'
Merge pull request #91 from shawnacscott/master

Replace links to code.google.com; update copyright date