Schedule periodic Travis cron jobs on YARP's devel branch

roboticslab-uc3m/questions-and-answers#17

.travis.yml

@@ -10,6 +10,7 @@ compiler:
   - clang
 
 before_install:
+  - '[[ "$TRAVIS_EVENT_TYPE" = cron ]] && export YARP_CHECKOUT=devel || export YARP_CHECKOUT=master'
   #-- Install cmake
   - if [ "$TRAVIS_OS_NAME" = "linux" ]; then sudo apt-get install cmake; fi
   #-- Install opencv
@@ -41,7 +42,7 @@ install:
   - sudo ln -s $PWD/NiTE-Linux-x64-2.2/Redist/libNiTE2.so /usr/local/lib/
   - sudo ln -s $PWD/NiTE-Linux-x64-2.2/Include /usr/local/include/NiTE-Linux-x64-2.2
   #-- Install yarp
-  - git clone https://github.com/robotology/yarp
+  - git clone --branch="$YARP_CHECKOUT" https://github.com/robotology/yarp
   - cd yarp && mkdir build && cd build
   - cmake .. -DSKIP_ACE=ON -DCREATE_LIB_MATH=ON -DCREATE_DEVICE_LIBRARY_MODULES=ON -DENABLE_yarpmod_OpenNI2DeviceServer=ON -DOPENNI2_INCLUDE_LOCAL=/usr/local/include/OpenNI2/ -DOPENNI2_LIBRARY=/usr/local/lib/libOpenNI2.so -DNITE2_INCLUDE_LOCAL=/usr/local/include/NiTE-Linux-x64-2.2 -DNITE2_LIBRARY=/usr/local/lib/libNiTE2.so -DYARP_USE_QT5=OFF
   - make