Update test and release instructions

[smith]

• Fix headings in README
• Update copyright
• Commit bin/rspec and update instructions to use it
• Add instructions for releasing

[mmzyk]

:+1:

Why was the v added to the tags for the 0.3.6 release, out of curiosity?

[smith]

@mmzyk because Bundler's rake release task uses a v prefix and there's no way to change it: http://stackoverflow.com/q/18134376