Update author field

Requested by @silvamerica - :+1:
Use unprefixed rAF and cAF first, if available
Merge pull request #56 from box/use-unprefixed-raf

Use unprefixed rAF and cAF first, if available
Add realtime plugin
Fix race condition with page streaming if a doc is already finished converting
Move message queueing into scope; add realtimeupdate event to realtime plugin
Add realtime example with simulated conversion and SSE
Update readme to mention realtime plugin
Handle realtime `error` events better