Add polling-station project dependency to VB build.gradle for testing purposes

voting-booth/build.gradle

@@ -60,6 +60,10 @@ dependencies {
     testCompile 'junit:junit:4.+'
 
     runtime 'org.codehaus.groovy:groovy:2.4.+'
+
+    // Meerkat polling station
+    compile project(':polling-station')
+
 }