Added support for multiple attribute checks in same call and wildcard ouput/perf

I've made changes to allow multiple keys to affect the check result which is reduces the number of checks required when checking multiple values.

I've also aded the option to use wild card in output or perf.

ex: ./check_json.pl -u <URL> -a '{key1},{key2},...' -c <crit1>,<crit2>,... -w <warn1>,<warn2>,... -p '*'