LP#1316245: JS now uses browser-native JSON routines

* Replace JSON2jsRaw() with JSON.parse()

* Replace js2JSONRaw() with JSON.stringify()

* Removed unit tests for JSON2jsRaw() and js2JSONRaw()

* Removed jsonPretty() pretty-printing routine.  Use
  JSON.stringify(json, null, <spaces>) instead.

See also:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Using_native_JSON

Signed-off-by: Bill Erickson <berick@esilibrary.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>