Updated .travis.yml with g2o, openni2 and octomap dependencies

.travis.yml

@@ -13,12 +13,13 @@ addons:
       - libopencv-dev
       - libqt4-dev
       - libsqlite3-dev
+      - libopenni2-dev
 
 install:
     - sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu trusty main" > /etc/apt/sources.list.d/ros-latest.list'
     - wget http://packages.ros.org/ros.key -O - | sudo apt-key add -
     - sudo apt-get update
-    - sudo apt-get -y install libpcl-1.7-all libfreenect-dev
+    - sudo apt-get -y install libpcl-1.7-all libfreenect-dev ros-indigo-libg2o ros-indigo-octomap
 
 script: 
     - mkdir -p build && cd build