generics - contravariance inf filter types (allow filters for any
supertype of the element type)
BAZYNGO-1457: moved general comparators to ledge-web
BAZYNGO-1457: added support for all Comparable types
BAZYNGO-1457: added reflection based property accessor
BAZYNGO-1457: fixed type checks
Merge branch 'dev' for release 1.0.19
release 1.0.19