Headers and indentations improved
Double quotes for id
trailing whitespaces removed
Default compact selection and Expanded tab issues resolved
White spaces erased
White spaces erased in primer/index.php
Merge pull request #283 from ivikash/playground

Fix some playground bugs.
Clarify that UI for JSON-LD context is for a new context, some fixes.

- Do not process query parameters if not present (allows placeholder
  text to display).
prefix indentation improved in index.html
Merge pull request #280 from ivikash/navbar

Headers and indentations improved
Fixed broken markup in description of playground.
Fixed broken formatting of JSON-LD example on landing page.
Footer Rectified with CC0
Merge pull request #285 from ivikash/footer

Page footer fixed, now all footers state CC0 license.