* multiple post json rest request
i.e curl -si -HX-User:admin -HX-Password:admin -XPOST
http://localhost:8082/structr/rest/files -d '[{ "name": "test0.txt",
"contentType": "text/plain", "size": 0 },{ "name": "test1.txt",
"contentType": "text/plain", "size": 0 }]'
Merge pull request #269 from dlaske/master

 * multiple post json rest requests