Merge pull request #5 from mattcottingham/master

Add section on authentication
Changed html5shim to protocol aware scheme
Merge pull request #6 from mattcottingham/master

Add more background on Mozilla Persona to authentication section
Changed URLs for API calls to the sandbox
Updated the pagination section to add two helper fields to assist devs in producing any kind of pagination UI without errors
Missing s of a CURL example
Updated ref to dev server, TODO: re-run all example CURL statements to generate fresh versions of the output
Updated all examples to use the sandbox
Added HEAD where applicable