Add oEmbed support
Add oEmbed type and version
Fix oembed title.
Validate incoming url against config
Get settings from app, avoid unnecessary require.
Some tweaks

- Use res.jsonp + res.json for "safe" jsonp response
- Fix /edit replacing with /embed (didn't work when there was no query on edit)
- Return a JS Bin 400 page, rather than plain express 400
- Party time!
Merge branch 'malditogeek-feature/oembed-support'