fix syntax error in build_in_travis_ci.sh

.travis.yml

@@ -9,7 +9,7 @@ compiler:
 env:
 - PURPOSE=compile
 - PURPOSE=unittest
-- PURPOSE=bazel_build
+- PURPOSE=compile-with-bazel
 
 before_install:
 - wget --no-clobber https://github.com/bazelbuild/bazel/releases/download/0.8.1/bazel_0.8.1-linux-x86_64.deb

build_in_travis_ci.sh

@@ -20,7 +20,7 @@ if [ "$PURPOSE" = "compile" ]; then
     make -j4 && sh tools/make_all_examples
 elif [ "$PURPOSE" = "unittest" ]; then
     cd test && sh ./run_tests.sh
-elif [ "$PURPOSE" = "bazel_build"]; then
+elif [ "$PURPOSE" = "compile-with-bazel" ]; then
     bazel build --copt -DHAVE_ZLIB=1 //...
 else
     echo "Unknown purpose=\"$PURPOSE\""