Add logging context for serializer
Add typename getter for object type
Add logging call for error on opening main map
Add error log call on serializer error for serializing response
Add error log call on error closing main map
Add error log call in key generator helper
Add unlikely() macro for key generator errors
Add error logging calls for serializing an error reply
Add unlikely() macros for value reply serialization
Add serializing error log calls for serialize_value()
Add error log call for error on serializing id string
Add error log calls in serialize_reply_value_reply()
Add unlikely() macros in serialize_event() for error in key generation
Add error log calls in serialize_event()
Remove @todo, logging call is in called function
Add unlikely() macro in serialize_event()
Add logging call if serialization of set was aborted in serialize_value()
Added unref() call in "I am ready" case

Suggested-by: Julian Ganz <Julian.Ganz@hs-furtwangen.de>
Return -EIO instead of -1 in case of error
Merge pull request #639 from matthiasbeyer/add-json_serializer_error_handling

Add json-serializer error handling