Fix std.parseHex that rejected certain correct inputs
Added std.find and std.findSubstr
Added std.parseJson
std.native("foo") now returns null if foo doesn't exist, instead of an error. This is useful for falling back on Jsonnet implementations if a faster native one isn't available.
sort and set functions can now be given a "keyF" function for controlling the ordering
std.trace for debugging
std.parseHex
std.parseOctal
Major (2x-10x) improvements in performance via a substantial refactoring of the interpreter
Relevant changelog (0.10.x -> 0.12.x):