Convert pid of indexer to binary
Convert pid of indexer to binary

This is a fixup for https://github.com/apache/couchdb-couch-mrview/pull/62
Properties passed to couch_task_status:add_task cannot contain complex
types. Because the status need to be representable in JSON.

fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb