Merge branch 'migrate.to.kotlin.#123'

* migrate.to.kotlin.#123: (25 commits)
  fix file includes for resulting JARs
  centralize and upgrade dependencies
  get rid of not required LifecyclePlugin wrapper
  use Kotlins "it" for simple closures
  prefer methods which favor configuration avoidance
  introduce caching for travis CI builds
  use Bnd Gradle Plugins via plugins {} API
  migrate remaining publishing configuration to Kotlin DSL (#123)
  migrate cpd config (#123)
  migrate coveralls and its required jacoco config (#123)
  remove no longer used TouchTestResults class in legacy build file (#123)
  migrate second generic subprojects configuration to Kotlin DSL (#123)
  migrate junit-jupiter and junit-jupiter-params subprojects configuration to Kotlin DSL (#123)
  migrate junit-jupiter* subproject configuration to Kotlin DSL (#123)
  migrate junit4 subproject configuration to Kotlin DSL (#123)
  migrate core subproject configuration to Kotlin DSL (#123)
  migrate first generic subprojects configuration to Kotlin DSL (#123)
  migrate extra properties, buildScan and allprojects configuration to Kotlin DSL (#123)
  prepare stepwise migration by splitting build logic (#123)
  add parantheses which can be omitted in Groovy but not Kotlin (#123)
  ...

.travis.yml

@@ -1,12 +1,19 @@
 language: java
+
+os: linux
 dist: trusty
 sudo: false
 
-script:
-  - ./gradlew build -Pjunit4Version=4.10  -PjunitJupiterVersion=5.5.0-RC2 -PskipSpotBugs
-  - ./gradlew build -Pjunit4Version=4.11  -PjunitJupiterVersion=5.5.0     -PskipSpotBugs
+jdk:
+  - openjdk8
+  - oraclejdk8
+  - oraclejdk9
+  - oraclejdk11
 
-  - ./gradlew build
+script:
+  - ./gradlew --scan build -Pjunit4Version=4.10  -PjunitJupiterVersion=5.5.0-RC2 -PskipSpotBugs
+  - ./gradlew --scan build -Pjunit4Version=4.11  -PjunitJupiterVersion=5.5.0     -PskipSpotBugs
+  - ./gradlew --scan build
 
   - cd ${TRAVIS_BUILD_DIR}/junit4/
   - mvn test
@@ -18,12 +25,15 @@ script:
   - cd ${TRAVIS_BUILD_DIR}/junit-jupiter-params/
   - mvn test
 
-jdk:
-  - openjdk8
-  - oraclejdk8
-  - oraclejdk9
-  - oraclejdk11
+before_cache:
+  - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
+  - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
+
+cache:
+  directories:
+    - $HOME/.gradle/caches/
+    - $HOME/.gradle/wrapper/
 
 after_success:
   - cd ${TRAVIS_BUILD_DIR}
-  - ./gradlew jacocoRootReport coveralls
+  - ./gradlew --scan jacocoRootReport coveralls