Log id returned by broker

[k4ml]

This will make it easy to inspect broker directly for particular message.

[codecov-io]

Current coverage is 90.80%

Merging #148 into master will decrease coverage by -5.81% as of b792811

@@            master   #148   diff @@
=====================================
  Files           39     39       
  Stmts         2718   2719     +1
  Branches         0      0       
  Methods          0      0       
=====================================
- Hit           2626   2469   -157
  Partial          0      0       
- Missed          92    250   +158

Review entire Coverage Diff as of b792811

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