format_json.py: Put all the JSON on a single line.

If the JSON is not valid, raises an exception

format-json.sh is deleted because format_json.py has
similar features while checking syntax additionnally.

algo/tests/format-json.sh

-#!/bin/sh
-
-tr "\n" " " | sed "s/}/}\n/g"

tools/format_json.py

+import json
+import sys
+from collections import OrderedDict
+
+f = sys.stdin
+if len(sys.argv) > 1:
+    f = open(sys.argv[1])
+s = f.read()
+print json.dumps(OrderedDict(json.loads(s, object_pairs_hook=OrderedDict))).replace('\n', ' ')
+
+