Return score value on create
Added meta_doc column to scores:

Storing on local disk for now.  Will move to s3.
Used for ghost data
S3 used in development if OK_S3_ATTACHMENT_BUCKET env var is set
Added tracer_bullet to see approx save times to S3
Including meta_doc_url in score json
Not including user json in score post
Protection against getting something other than array for fbid list