docs(README.md): release 3.8.0
fix(htaccess): Rewrite rules for new docs
docs(docs/endpoint_handlers/amazon-s3.jmd): clarification

You can also pass any data to your Fine Uploader
"complete" event handler, client-side, by including it in a
JSON response to this request.
chore(-): re-trigger travis build since sauce labs is failing for some reason
docs(messages option docs): forgot to document "too many items" messages
docs(quickstart/02-setting_options-s3): Link to S3 options, not Core

This would have been confusing to users.
Merge branch 'master' into develop
chore(*): kick off 3.9.0 release cycle