interpret criteria key as JSONPath to allow filting on nested properties
add a method to safely read a path from a map, turning an InvalidPathException into a null return value
change simple criteria to use readSafely
fix EXISTS filter
fix TYPE filter
fix IS filter
add filter evaluation on collections
collection-based filtering for number-based filters
make EXISTS test work with collections
forbid usage of collection-related filters on multi-level paths as they would most likely be ambigous
fix REGEX filter
make TYPE filter work on multi-level path
make NE and IS filters work on multi-level paths
add some tests
Merge pull request #16 from jochenberger/use-jsonpath-in-filters

Use jsonpath in filters