Keen Kangaroo

New features:

• Allow any monitor's metric log's rate limiter to be modified via configuration, along with flush aggregation.
• Provide --upgrade-without-ui on scalyr-agent-2-config to allow upgrading the agent without UI (Windows).
• Write user-friendly error message to event log when a major configuration problem is seen during start up (Windows)

Bug fixes:

• Do not fail Scalyr Agent service start if configuration file registry is not set (Windows).
• Remove rate limiter on metric log for graphite monitor and add in flush aggregation.
• Fix that prevented graphite monitor thread from starting when accepting both text and pickle protocols