Added circle ci build support

Author: dilipkrish

circle.yml

@@ -0,0 +1,31 @@
+general:
+  branches:
+    ignore:
+      - gh-pages
+
+machine:
+  java:
+    version: oraclejdk8
+  environment:
+    TERM: dumb
+    CI_NAME: Circle-CI
+    CI_BRANCH: $CIRCLE_BRANCH
+    CI_BUILD_NUMBER: $CIRCLE_BUILD_NUM
+    CI_BUILD_URL: $CIRCLE_COMPARE_URL
+#    GRADLE_OPTS: '-Dorg.gradle.daemon=false -Dorg.gradle.jvmargs="-Xmx3840m -XX:+HeapDumpOnOutOfMemoryError"'
+
+checkout:
+  post:
+    - git fetch --unshallow || true
+    - git fetch --tags
+
+dependencies:
+  pre:
+    - gem install asciidoctor
+  cache_directories:
+    - ~/.m2
+    - ~/.gradle
+test:
+  override:
+  - ./gradlew clean build jacocoTestReport
+  - bash <(curl -s https://codecov.io/bash)