Added flag for cmake 2

Author: Nesterov Alexander

.travis.yml

@@ -51,10 +51,7 @@ script:
 - python scripts/lint.py
 - mkdir build
 - cd build
-- cmake -D USE_MPI=ON \
-        -D USE_OMP=ON \
-        -D USE_TBB=ON \
-        -D CMAKE_BUILD_TYPE=RELEASE ..
+- cmake -D USE_MPI=ON -D USE_OMP=ON -D USE_TBB=ON -D CMAKE_BUILD_TYPE=RELEASE ..
 - cmake --build .
 - cd ..
 - export OMP_NUM_THREADS=4