JSON diff according to RFC6902


Diff two JS objects and receive an RFC6902
JSON patch.

``js
var diff = require("rfc6902-json-diff");

var patch = diff(
{ name: "CQQL", age: 21, likes: ["api stuff"] },
{ name: "CQQL", age: 22, likes: ["api stuff", "json"] }
);

console.log(patch);
//=> [{ op: "replace", path: "/age", value: 22 },
//=> { op: "add", path: "/likes/1", value: "json" }]
`

Implementation

The current implementation only uses the add, remove and replace
operation. Usage of move and copy can and may be added later and I am always
open for pull requests, but they are not needed to generate patches for every
possible modification. Your patches will just be a bit bigger than they would
be with move and copy.

Arrays are diffed with the
Levenshtein distance. This
gives us

`js
diff([1, 2, 3, 4, 5, 6], [1, 5, 2, 3, 4, 6]) == [
{ op: "add", path: "/1", value: 5 },
{ op: "remove", path: "/5" }
]
`

instead of 5 replace` operations.