BUG: 2579 - No longer warning on minor version changes to datasync and
no longer failing jobs because of major version changes; rather we only
warn for major version changes.  Also, this removes the dependency on
adrian's demo site for storing the current version and its download
link; instead we are querying the github api for the latest release and
using the pom to gather the version of the jar in use.

Reviewed-by: john