Increased the width and height of the content inspector for improved viewing of entity content when in formats such as JSON or XML
Handled and logged exceptions in escalation manager and diff sweeper background threads so issues like loss of database or network instability don't cause the timers to die silently
Fixed some timezone related issues that came up as we moved to BST.  Not every change here may be absolutely necessary since, after making these changes a separate and significant timezone issue was found and fixed in the C# participant library, however any additional UTC checks can't hurt
Reverted a timezone-related change causing integration test issues and fixed missing reference to slf4j in the sweeper
Added v1.5.9 release notes
Merged #286 into 1.5.8 series