Migrated everything except

- the Bytes utilities class - it's easier to do in Java as with Kotlin byte + byte = int
- the demo project, which I'm not sure I'll migrate. Maybe I'll make a new Kotlin Demo application

repositories/build.gradle

@@ -17,7 +17,7 @@ dependencies {
     compile 'org.flywaydb:flyway-core:4.1.2'
     testCompile 'junit:junit:4.12'
     testCompile 'com.h2database:h2:1.4.194'
-    testCompile 'org.mockito:mockito-core:2.7.21'
+    testCompile 'com.nhaarman:mockito-kotlin:1.4.0'
     testCompile project(path: ':core', configuration: 'testArtifacts')
     testCompile project(':cryptography-bc')
 }