Prepare for Travis CI

.bazelrc-travis

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+build --verbose_failures

.travis.yml

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+dist: bionic
+sudo: required
+language: sh
+
+addons:
+  apt:
+    packages:
+    - libxml2-utils
+
+cache:
+    directories:
+     - .bazel_cache
+     - ~/.bazel_binaries
+
+_linux: &linux
+  os: linux
+_osx: &osx
+  os: osx
+  osx_image: xcode10.1
+
+jobs:
+  include:
+# Test
+    - <<: *linux
+    - <<: *osx
+
+before_install:
+  - |
+    if [[ "${TRAVIS_OS_NAME}" == "osx" ]]; then
+      OS=darwin
+    else
+      OS=linux
+    fi
+    URL="https://github.com/bazelbuild/bazel/releases/download/2.0.0/bazel-2.0.0-installer-${OS}-x86_64.sh"
+    wget -O install.sh "${URL}"
+    chmod +x install.sh
+    ./install.sh --user
+    rm -f install.sh
+  - cp .bazelrc.travis .bazelrc-local
+script:
+  - |
+    bash bazel test //...
+