Pin bazel version in travis builds (#207)

.travis.yml

@@ -11,21 +11,13 @@ matrix:
     jdk: oraclejdk8
     env: BUILD=GRADLE
 
-before_install:
-  - case "$BUILD" in
-      "BAZEL")
-        echo "deb [arch=amd64] http://storage.googleapis.com/bazel-apt stable jdk1.8" | sudo tee /etc/apt/sources.list.d/bazel.list ;
-        curl https://storage.googleapis.com/bazel-apt/doc/apt-key.pub.gpg | sudo apt-key add - ;
-        sudo apt-get update ;;
-    esac
-
 install:
   - case "$BUILD" in
       "BAZEL")
-        sudo apt-get install bazel ;
-        echo "build --disk_cache=$HOME/bazel-cache" > ~/.bazelrc ;
-        echo "build --experimental_strict_action_env" >> ~/.bazelrc ;
-        bazel version;;
+        curl -LO "https://github.com/bazelbuild/bazel/releases/download/0.26.0/bazel_0.26.0-linux-x86_64.deb" ;
+        sudo dpkg -i bazel_*.deb ;
+        sudo apt-get install -f ;
+        bazel version ;;
     esac
 
 script: