Merge branch 'release/0.5.2' into develop
[iframely.js] fix searching video preview image
[api] oembed 1.0 endpoint
[api] oembed rich reader (not inline)
[api] oembed - minor fixes
[iframely.js] limited lib version for resizing iframes
Improve intro for the whitelist folder
[api] support jsonp for oembed endpoint
Docs for /oembed endpoint
update to 0.5.3
Merge branch 'release/0.5.3'