Update test runner and coverage for CI

.travis.yml

@@ -1,8 +1,12 @@
 language: java
 jdk:
   - oraclejdk8
+after_success:
+- bash <(curl -s https://codecov.io/bash)
 before_install:
-  - gradle wrapper
+  - gradle -b gradle/wrapper.gradle
+  - mv gradle/gradlew gradle/gradlew.bat .
+  - mv gradle/gradle/wrapper gradle/
 before_cache:
   - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
   - rm -fr $HOME/.gradle/caches/*/plugin-resolution/