Code example didn't run.

Code doesn't run as the <polymer-ajax> element hasn't got an ID. Changed to query the tag instead rather than adding the ID.
Merge pull request #283 from richbradshaw/patch-1

Code example didn't run.
Small typo

refereced -> referenced
Merge pull request #285 from richbradshaw/patch-1

Small typo
Fixes #286. Broken links to polymer ui elements
Image dimensions on desktop
Merge branch 'master' into ajaxify
Fix mobile styles not being applied