Added BitBucket and GitLab CIs.

More code cleanup.

.gitlab-ci.yml

@@ -0,0 +1,32 @@
+image: openjdk:11-jdk-slim
+
+variables:
+  GRADLE_OPTS: "-Dorg.gradle.daemon=false"
+  CI_NAME: "GitLab CI"
+
+before_script:
+  - export GRADLE_USER_HOME=`pwd`/.gradle
+
+stages:
+  - build
+  - test
+
+build:
+  stage: build
+  script: ./gradlew --build-cache assemble
+  cache:
+    key: "$CI_COMMIT_REF_NAME"
+    policy: push
+    paths:
+      - build
+      - .gradle
+
+test:
+  stage: test
+  script: ./gradlew check
+  cache:
+    key: "$CI_COMMIT_REF_NAME"
+    policy: pull
+    paths:
+      - build
+      - .gradle