Added benchmark scripts

bench/get_json_libs.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+# Downloads other JSON libraries for use in the benchmark scripts
+
+# Remove libraries
+rm dkjson.lua   2>/dev/null
+rm jfjson.lua   2>/dev/null
+rm json4lua.lua 2>/dev/null
+
+# Get libraries
+echo "Downloading json libs..."
+curl -sS -o dkjson.lua    "https://raw.githubusercontent.com/LuaDist/dkjson/master/dkjson.lua"
+curl -sS -o json4lua.lua  "https://raw.githubusercontent.com/craigmj/json4lua/master/json/json.lua"
+curl -sS -o jfjson.lua    "http://regex.info/code/JSON.lua"
+
+echo "Done"