Added example code to do filtering Orion requested.  (see src/main/resources/testing.html - click the blue 'Get Filtered Variants' to fetch the first ten variants.)

The javascript method 'getFilteredVariants' is a wrapper that calls 'getOrionFilteredVariants' -- where the filter values are actually defined.  The fetched variants are then passed to a Javascript function 'processFilteredVariants'
Set PHENOME_CENTRAL_PROJECT_NAME appropriately.