Moved delim to be format specific
Moved readLines from PivotSpec to Reference
Add EAV extraction format
Update docs
Merge pull request #304 from ambiata/topic/eav-extract-format

Sparse extract format
Made TombstoneValue a case object
Tombstone is not a primitive value
Introduce tombstone as top-level value in ingest thrift format
Remove tombstone as primitive of ingest format