Be more explicit on values of ?STREAM_STATUS

Also I should add a note about how the changes ending due to a throw
when processing the last_seq leads to the un-consumed stream messages.

This is a cherry-pick of:

https://github.com/cloudant/couch_replicator/commit/20d11c7d342ea77ffd5384d75e9cd570cbcbf5ba
1 file changed
tree: b4144c7b6f9f1e42c67619eec0f3cb3b15fea23c
  1. priv/
  2. src/
  3. test/
  4. .gitignore