update index erb in members view to include JSON button
added autodiscovery link for JSON data in HTML header
revised to actually point to the right json path
pop format buttons at the bottom right instead of top left
Add rel=alternate to json link
Add and use alternate_url helper for generating json variants of current URL
Move alternate button into a helper for reuse

includes auto-lookup of mime type for requested format
removed debug line
Extract alternate formats into a partial
Add alternate format links to individual member page
Merge branch 'refs/heads/feature-224-json-link-in-html-header' into feature-link-to-json-in-members-page
Set up alternate format list in before filter
Add partial for alternate links in header
Merge pull request #99 from theodi/feature-link-to-json-in-members-page

updated index.html.erb in members view to include JSON button