Use new version of Nordpol from jcenter

- Use version 0.1.13 that is now available on jcenter
- Add a "gradle witness" for this version

build.gradle

@@ -23,9 +23,6 @@ buildscript {
 allprojects {
     repositories {
         jcenter()
-        maven {
-            url 'http://releases.marmeladburk.fidesmo.com'
-        }
     }
 }