Modified JSON and BARBECUE deps to use external maven sources

voting-booth-gui/build.gradle

@@ -57,10 +57,10 @@ dependencies {
     compile 'com.google.protobuf:protobuf-java:3.+'
 
     // Json configuraiton parsing
-    compile name: 'java-json'
+    compile group: 'org.json', name: 'json', version: '20160810'
 
     // Jar that creates barcodes
-    compile name: 'barbecue-1.5-beta1'
+    compile group: 'net.sourceforge.barbecue', name: 'barbecue', version: '1.5-beta1'
 
     testCompile 'junit:junit:4.+'