Increased resiliency and better logging

API changes:

• None

Improvements;

• Queries that have transient failures on the server are automatically retried. Issue#5
• Fuzzy JSON unmarshalling into map[string]interface{} tries to unmarshal Insights time fields @timestamp and @ingestionTime into time.Time if possible. Issue#7
• Log messages about chunks now contain the query chunk ID. Issue#6
  • Where possible the CWL query ID for the chunks is logged, as long as it has been assigned from a successful StartQuery call.
  • Always, an internal chunk ID is logged. The chunk ID is basically the chunk index within the stream, plus a suffix to indicate how many times it has been retried.
• Finishing of a chunk is now logged consistently. Issue#8