Add travis ci to project

language: android

jdk: oraclejdk8

os: linux

sudo: false

android:

  components:

    - tools

    - tools

    - platfom-tools

    - build-tools-25.0.2

    - android-25

    - extra-android-m2repository

  licenses:

    - 'android-sdk-license-+'

script: ./gradlew build --stacktrace

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