Set the PATH env within the travis file as it won't get exported

otherwise.

.travis.yml

 
 install:
   - script/ci_install.sh
+  - export PATH="${DEPENDENCY_DIR}/cmake/bin:${PATH}"
 
 script:
   - script/ci_build.sh

script/ci_install.sh

     wget --no-check-certificate --quiet -O - "${CMAKE_URL}" | tar --strip-components=1 -xz -C cmake
 fi
 
-export PATH="${DEPENDENCY_DIR}/cmake/bin:${PATH}"
-cmake --version
-
 cd ${BUILD_DIR}