JAL-3383 JAL-3253-applet

JAL-3383 JAL-3253-applet

-- Dissociates IntervalStore and BinarySearch from FeatureStoreJS.
-- Adds test FeatureStoreJS
-- cursory timing test in TestNG suggest JS version is 2x faster in
*Java* (TestNG FeatureStoreTest 120 ms vs. FeatueStoreJSTest 66 ms) for
default test.
-- hypothesize that overhead of lambda functions is coming into play
here. Needs a more heavy-duty test.